diff --git a/src/rpc/abc.cpp b/src/rpc/abc.cpp
--- a/src/rpc/abc.cpp
+++ b/src/rpc/abc.cpp
@@ -17,7 +17,7 @@
         throw std::runtime_error(
             RPCHelpMan{
                 "getexcessiveblock", "\nReturn the excessive block size.", {}}
-                .ToString() +
+                .ToStringWithArgs() +
             "\nResult\n"
             "  excessiveBlockSize (integer) block size in bytes\n"
             "\nExamples:\n" +
@@ -40,14 +40,12 @@
                 "used in the active chain or relayed. This discourages the "
                 "propagation of blocks that you consider excessively large.",
                 {
-                    {"blockSize", RPCArg::Type::NUM, false},
+                    {"blockSize", RPCArg::Type::NUM, /* opt */ false,
+                     /* default_value */ "",
+                     "Excessive block size in bytes.  Must be greater than " +
+                         std::to_string(LEGACY_MAX_BLOCK_SIZE) + "."},
                 }}
-                .ToString() +
-            "\nArguments\n"
-            "1. blockSize  (integer, required) Excessive block size in bytes.  "
-            "Must be greater than " +
-            std::to_string(LEGACY_MAX_BLOCK_SIZE) +
-            ".\n"
+                .ToStringWithArgs() +
             "\nResult\n"
             "  blockSize (integer) excessive block size in bytes\n"
             "\nExamples:\n" +
diff --git a/src/rpc/util.h b/src/rpc/util.h
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -53,10 +53,41 @@
     //! Only used for arrays or dicts
     const std::vector<RPCArg> m_inner;
     const bool m_optional;
+    const std::string m_default_value; //!< Only used for optional args
+    const std::string m_description;
     //! Should be empty unless it is supposed to override the auto-generated
     //! summary line
     const std::string m_oneline_description;
 
+    //! Should be empty unless it is supposed to override the
+    //! auto-generated type strings. Vector length is either 0
+    //! or 2, m_type_str.at(0) will override the type of the
+    //! value in a key-value pair, m_type_str.at(1) will
+    //! override the type in the argument description.
+    const std::vector<std::string> m_type_str;
+
+    RPCArg(const std::string &name, const Type &type, const bool opt,
+           const std::string &default_val, const std::string &description,
+           const std::string &oneline_description = "",
+           const std::vector<std::string> &type_str = {})
+        : m_name{name}, m_type{type}, m_optional{opt},
+          m_default_value{default_val}, m_description{description},
+          m_oneline_description{oneline_description}, m_type_str{type_str} {
+        assert(type != Type::ARR && type != Type::OBJ);
+    }
+
+    RPCArg(const std::string &name, const Type &type, const bool opt,
+           const std::string &default_val, const std::string &description,
+           const std::vector<RPCArg> &inner,
+           const std::string &oneline_description = "",
+           const std::vector<std::string> &type_str = {})
+        : m_name{name}, m_type{type}, m_inner{inner}, m_optional{opt},
+          m_default_value{default_val}, m_description{description},
+          m_oneline_description{oneline_description}, m_type_str{type_str} {
+        assert(type == Type::ARR || type == Type::OBJ);
+    }
+
+    // Remove once PR14796 backport is completed
     RPCArg(const std::string &name, const Type &type, const bool optional,
            const std::string &oneline_description = "")
         : m_name{name}, m_type{type}, m_optional{optional},
@@ -64,6 +95,7 @@
         assert(type != Type::ARR && type != Type::OBJ);
     }
 
+    // Remove once PR14796 backport is completed
     RPCArg(const std::string &name, const Type &type,
            const std::vector<RPCArg> &inner, const bool optional,
            const std::string &oneline_description = "")
@@ -72,9 +104,30 @@
         assert(type == Type::ARR || type == Type::OBJ);
     }
 
+    // Remove once PR14796 backport is completed
     std::string ToString() const;
 
+    /**
+     * Return the type string of the argument.
+     * Set oneline to allow it to be overrided by a custom oneline type string
+     * (m_oneline_description).
+     */
+    std::string ToString(bool oneline) const;
+    /**
+     * Return the type string of the argument when it is in an object (dict).
+     * Set oneline to get the oneline representation (less whitespace)
+     */
+    std::string ToStringObj(bool oneline) const;
+    /**
+     * Return the description string, including the argument type and whether
+     * the argument is required.
+     * implicitly_required is set for arguments in an array, which are neither
+     * optional nor required.
+     */
+    std::string ToDescriptionString(bool implicitly_required = false) const;
+
 private:
+    // Remove once PR14796 backport is completed
     std::string ToStringObj() const;
 };
 
@@ -86,6 +139,9 @@
 
     std::string ToString() const;
 
+    // Remove once PR14796 backport is completed
+    std::string ToStringWithArgs() const;
+
 private:
     const std::string m_name;
     const std::string m_description;
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -115,6 +115,146 @@
     return boost::apply_visitor(DescribeAddressVisitor(), dest);
 }
 
+struct Section {
+    Section(const std::string &left, const std::string &right)
+        : m_left{left}, m_right{right} {}
+    const std::string m_left;
+    const std::string m_right;
+};
+
+struct Sections {
+    std::vector<Section> m_sections;
+    size_t m_max_pad{0};
+
+    void PushSection(const Section &s) {
+        m_max_pad = std::max(m_max_pad, s.m_left.size());
+        m_sections.push_back(s);
+    }
+
+    enum class OuterType {
+        ARR,
+        OBJ,
+        // Only set on first recursion
+        NAMED_ARG,
+    };
+
+    void Push(const RPCArg &arg, const size_t current_indent = 5,
+              const OuterType outer_type = OuterType::NAMED_ARG) {
+        const auto indent = std::string(current_indent, ' ');
+        const auto indent_next = std::string(current_indent + 2, ' ');
+        switch (arg.m_type) {
+            case RPCArg::Type::STR_HEX:
+            case RPCArg::Type::STR:
+            case RPCArg::Type::NUM:
+            case RPCArg::Type::AMOUNT:
+            case RPCArg::Type::BOOL: {
+                // Nothing more to do for non-recursive types on first recursion
+                if (outer_type == OuterType::NAMED_ARG) {
+                    return;
+                }
+                auto left = indent;
+                if (arg.m_type_str.size() != 0 &&
+                    outer_type == OuterType::OBJ) {
+                    left += "\"" + arg.m_name + "\": " + arg.m_type_str.at(0);
+                } else {
+                    left += outer_type == OuterType::OBJ
+                                ? arg.ToStringObj(/* oneline */ false)
+                                : arg.ToString(/* oneline */ false);
+                }
+                left += ",";
+                PushSection({left, arg.ToDescriptionString(
+                                       /* implicitly_required */ outer_type ==
+                                       OuterType::ARR)});
+                break;
+            }
+            case RPCArg::Type::OBJ:
+            case RPCArg::Type::OBJ_USER_KEYS: {
+                const auto right =
+                    outer_type == OuterType::NAMED_ARG
+                        ? ""
+                        : arg.ToDescriptionString(
+                              /* implicitly_required */ outer_type ==
+                              OuterType::ARR);
+                PushSection({indent + "{", right});
+                for (const auto &arg_inner : arg.m_inner) {
+                    Push(arg_inner, current_indent + 2, OuterType::OBJ);
+                }
+                if (arg.m_type != RPCArg::Type::OBJ) {
+                    PushSection({indent_next + "...", ""});
+                }
+                PushSection(
+                    {indent + "}" +
+                         (outer_type != OuterType::NAMED_ARG ? "," : ""),
+                     ""});
+                break;
+            }
+            case RPCArg::Type::ARR: {
+                auto left = indent;
+                left += outer_type == OuterType::OBJ
+                            ? "\"" + arg.m_name + "\": "
+                            : "";
+                left += "[";
+                const auto right =
+                    outer_type == OuterType::NAMED_ARG
+                        ? ""
+                        : arg.ToDescriptionString(
+                              /* implicitly_required */ outer_type ==
+                              OuterType::ARR);
+                PushSection({left, right});
+                for (const auto &arg_inner : arg.m_inner) {
+                    Push(arg_inner, current_indent + 2, OuterType::ARR);
+                }
+                PushSection({indent_next + "...", ""});
+                PushSection(
+                    {indent + "]" +
+                         (outer_type != OuterType::NAMED_ARG ? "," : ""),
+                     ""});
+                break;
+            }
+
+                // no default case, so the compiler can warn about missing cases
+        }
+    }
+
+    std::string ToString() const {
+        std::string ret;
+        const size_t pad = m_max_pad + 4;
+        for (const auto &s : m_sections) {
+            if (s.m_right.empty()) {
+                ret += s.m_left;
+                ret += "\n";
+                continue;
+            }
+
+            std::string left = s.m_left;
+            left.resize(pad, ' ');
+            ret += left;
+
+            // Properly pad after newlines
+            std::string right;
+            size_t begin = 0;
+            size_t new_line_pos = s.m_right.find_first_of('\n');
+            while (true) {
+                right += s.m_right.substr(begin, new_line_pos - begin);
+                if (new_line_pos == std::string::npos) {
+                    // No new line
+                    break;
+                }
+                right += "\n" + std::string(pad, ' ');
+                begin = s.m_right.find_first_not_of(' ', new_line_pos + 1);
+                if (begin == std::string::npos) {
+                    break; // Empty line
+                }
+                new_line_pos = s.m_right.find_first_of('\n', begin + 1);
+            }
+            ret += right;
+            ret += "\n";
+        }
+        return ret;
+    }
+};
+
+// Remove once PR14796 backport is completed
 std::string RPCHelpMan::ToString() const {
     std::string ret;
 
@@ -146,6 +286,126 @@
     return ret;
 }
 
+// Rename to ToString() once PR14796 is completed
+std::string RPCHelpMan::ToStringWithArgs() const {
+    std::string ret;
+
+    // Oneline summary
+    ret += m_name;
+    bool is_optional{false};
+    for (const auto &arg : m_args) {
+        ret += " ";
+        if (arg.m_optional) {
+            if (!is_optional) {
+                ret += "( ";
+            }
+            is_optional = true;
+        } else {
+            // Currently we still support unnamed arguments, so any argument
+            // following an optional argument must also be optional If support
+            // for positional arguments is deprecated in the future, remove this
+            // line
+            assert(!is_optional);
+        }
+        ret += arg.ToString(/* oneline */ true);
+    }
+    if (is_optional) {
+        ret += " )";
+    }
+    ret += "\n";
+
+    // Description
+    ret += m_description;
+
+    // Arguments
+    Sections sections;
+    for (size_t i{0}; i < m_args.size(); ++i) {
+        const auto &arg = m_args.at(i);
+
+        if (i == 0) {
+            ret += "\nArguments:\n";
+        }
+
+        // Push named argument name and description
+        const auto str_wrapper = (arg.m_type == RPCArg::Type::STR ||
+                                  arg.m_type == RPCArg::Type::STR_HEX)
+                                     ? "\""
+                                     : "";
+        sections.m_sections.emplace_back(std::to_string(i + 1) + ". " +
+                                             str_wrapper + arg.m_name +
+                                             str_wrapper,
+                                         arg.ToDescriptionString());
+        sections.m_max_pad = std::max(sections.m_max_pad,
+                                      sections.m_sections.back().m_left.size());
+
+        // Recursively push nested args
+        sections.Push(arg);
+    }
+    ret += sections.ToString();
+
+    return ret;
+}
+
+std::string RPCArg::ToDescriptionString(const bool implicitly_required) const {
+    std::string ret;
+    ret += "(";
+    if (m_type_str.size() != 0) {
+        ret += m_type_str.at(1);
+    } else {
+        switch (m_type) {
+            case Type::STR_HEX:
+            case Type::STR: {
+                ret += "string";
+                break;
+            }
+            case Type::NUM: {
+                ret += "numeric";
+                break;
+            }
+            case Type::AMOUNT: {
+                ret += "numeric or string";
+                break;
+            }
+            case Type::BOOL: {
+                ret += "boolean";
+                break;
+            }
+            case Type::OBJ:
+            case Type::OBJ_USER_KEYS: {
+                ret += "json object";
+                break;
+            }
+            case Type::ARR: {
+                ret += "json array";
+                break;
+            }
+
+                // no default case, so the compiler can warn about missing cases
+        }
+    }
+    if (!implicitly_required) {
+        ret += ", ";
+        if (m_optional) {
+            ret += "optional";
+            if (!m_default_value.empty()) {
+                ret += ", default=" + m_default_value;
+            } else {
+                // TODO enable this assert, when all optional parameters have
+                // their default value documented
+                // assert(false);
+            }
+        } else {
+            ret += "required";
+            // Default value is ignored, and must not be present
+            assert(m_default_value.empty());
+        }
+    }
+    ret += ")";
+    ret += m_description.empty() ? "" : " " + m_description;
+    return ret;
+}
+
+// Remove once PR14796 backport is completed
 std::string RPCArg::ToStringObj() const {
     std::string res = "\"" + m_name + "\":";
     switch (m_type) {
@@ -175,6 +435,43 @@
     assert(false);
 }
 
+std::string RPCArg::ToStringObj(const bool oneline) const {
+    std::string res;
+    res += "\"";
+    res += m_name;
+    if (oneline) {
+        res += "\":";
+    } else {
+        res += "\": ";
+    }
+    switch (m_type) {
+        case Type::STR:
+            return res + "\"str\"";
+        case Type::STR_HEX:
+            return res + "\"hex\"";
+        case Type::NUM:
+            return res + "n";
+        case Type::AMOUNT:
+            return res + "amount";
+        case Type::BOOL:
+            return res + "bool";
+        case Type::ARR:
+            res += "[";
+            for (const auto &i : m_inner) {
+                res += i.ToString(oneline) + ",";
+            }
+            return res + "...]";
+        case Type::OBJ:
+        case Type::OBJ_USER_KEYS:
+            // Currently unused, so avoid writing dead code
+            assert(false);
+
+            // no default case, so the compiler can warn about missing cases
+    }
+    assert(false);
+}
+
+// Remove once PR14796 backport is completed
 std::string RPCArg::ToString() const {
     if (!m_oneline_description.empty()) {
         return m_oneline_description;
@@ -217,3 +514,46 @@
     }
     assert(false);
 }
+
+std::string RPCArg::ToString(const bool oneline) const {
+    if (oneline && !m_oneline_description.empty()) {
+        return m_oneline_description;
+    }
+
+    switch (m_type) {
+        case Type::STR_HEX:
+        case Type::STR: {
+            return "\"" + m_name + "\"";
+        }
+        case Type::NUM:
+        case Type::AMOUNT:
+        case Type::BOOL: {
+            return m_name;
+        }
+        case Type::OBJ:
+        case Type::OBJ_USER_KEYS: {
+            std::string res;
+            for (size_t i = 0; i < m_inner.size();) {
+                res += m_inner[i].ToStringObj(oneline);
+                if (++i < m_inner.size()) {
+                    res += ",";
+                }
+            }
+            if (m_type == Type::OBJ) {
+                return "{" + res + "}";
+            } else {
+                return "{" + res + ",...}";
+            }
+        }
+        case Type::ARR: {
+            std::string res;
+            for (const auto &i : m_inner) {
+                res += i.ToString(oneline) + ",";
+            }
+            return "[" + res + "...]";
+        }
+
+            // no default case, so the compiler can warn about missing cases
+    }
+    assert(false);
+}