Lemmy Support

I'm sure they're being worked on, but I haven't heard anything yet. Theoretically any fediverse bot will be able to make posts, though.

One place to start may be here: https://github.com/rileynull/RedditLemmyImporter

That takes Reddit comments and copies them to Lemmy. I have not used it and cannot say how well it works. But it's something to look at and a link I've seen thrown around often.

Theoretically, that's kind of what you want to do, just with RSS instead. (It may also be possible to mirror any arbitrary subreddit using RSS, as Reddit allows viewing subreddits as RSS... that'd be a cool bot to open-source if someone does have the skills.)