Groups boost posts from all users that mention them. https://a.gup.pe/ is one implementation of groups with mastodon (and other federated microblogging platforms) in mind, but lemmy communities actually work the same way when followed from mastodon. I believe other fediverse platforms implement groups in similar ways under the hood. This means that everything is more or less interoperable between platforms.

EDIT: Try it yourself! Follow technology@lemmy.world from Mastodon to see what I mean. Although I don't know that I would stay a follower of a community that large unless I wanted significant impacts on my feed. A smaller, potentially more useful, addition to your feed are things like gardening communities.