Can't yet, afaik, though mastodon users can follow lemmy users. I searched around a bit trying to figure out a way, and didn't find one

That’s a great question, I’d love to know the answer as well.

I'm no expert here, but that looks like a Mastodon link, and Lemmy itself doesn't federate with Mastodon. They both use activity pub, but it's not the same content. I think kbin does both.

So looks like it's not possible at the moment? I can't seem to find a kbin/lemmy/mastadon combined client for PC or Android?

Argh, this is why I can't ever get into Linux/BSD, etc. Just so many variants, and they go through cycles on which is popular.