[backport#17261 4/13] List output types in an array in order to be iterated over

Summary:
https://github.com/bitcoin/bitcoin/pull/17261/commits/81610eddbc57c46ae243f45d73e715d509f53a6c

Depends on D7848

Partial backport of Core PR17261

Test Plan:

ninja

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D7849