So, if you want to follow a Lemmy community from your Mastodon account you can simply do so as you would follow any other account. It will treat both posts and comments on that community as boosts. This quickly clogs up the feed and is very confusing to navigate.
Is there a way to have it show only the posts in my feed?
Sadly I haven’t found a way to do this. There’s got to be a better way to show up lemmy feeds, as it seems to be good to see the comments under the actual post instead of as new boosts.