Just to add and keep this topic alive: it would be absolutely wonderful to have this feature in Patreon to allow for a more content-specific way of preparing the posts in existing content systems before publishing them.
This has been requested since at least 2018 (Endpoints for posting content - #3 by blarghmatey) and I really hope that, at some point, Patreon’s developers and product owners would realize the power this could give creatives …