Mastodon instances have RSS feeds where each item links to it original location on its original instance, not the instance where you got the feed. This is useless for engagement, because you have to jump through hoops to reply to a post.
The issue states that there isn't an API for it. What isn't needed is an API to resolve a foreign toot to the local one, but for the Mastodon instance to make available the local feeds in RSS form in the first place. There is no logical reason that you can see local toots on some hashtag topics in the web UI, or an app, but not in RSS.
https://stackoverflow.com/questions/74579163/how-to-resolve-...
https://github.com/Riduidel/mastodon-rss/issues/7
The issue states that there isn't an API for it. What isn't needed is an API to resolve a foreign toot to the local one, but for the Mastodon instance to make available the local feeds in RSS form in the first place. There is no logical reason that you can see local toots on some hashtag topics in the web UI, or an app, but not in RSS.