Accidentally found earlier today you can follow communities/magazines as "group"-tagged users in Mastodon, e.g. https://mastodon.social/@fediverse@lemmy.world

The problem is that posts in the community appear as boosts on Mastodon, and even replies are treated as posts. So if you follow a community with high engagement there, your feed easily gets flooded by replies people make to a given post.

Hope that helps ^_^