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Misskey is, of course, very popular since it was developed by a Japanese person. I myself run a Misskey server.
Sorry, but I couldn’t find any information about plans for Misskey channels to federate with groups. Misskey’s developer is not very proactive about federation, so if this is true, that would be great to hear!
Just a small note: lm.korako.me has effectively stopped accepting new registrations.
Because of that, it was probably left out of the list this time.
I briefly explained the situation in the following post, so if you’re interested, please check it out: https://lm.korako.me/post/115527