I know that with the recent changes to the Twitter APIs it is extremely possible that if this was possible, it is no longer possible, or unlikely, but still as I recall with the Reddit API changes the third-party apps were going to stop working and although I don't use Reddit, I have seen that many Reddit apps still update and here on Lemmy there are those communities that are a mirror, although I guess they are an RSS.

Also, I want to clarify that I know I don't need a Mastodon account to follow an account there, but I wanted to explain it in a way that was easier to understand.