There's an open feature request for this: https://github.com/LemmyNet/lemmy/issues/818

u can use an rss reader and put their rss links in one folder, now u can read them together.

No, not possible at this time. It is a requested feature, so maybe eventually.

!slide@feddit.uk has subreddits as a feature built in and, while it is still early days, there's no reason it couldn't work here (Calckey has antennas which is, probably, fancier).

Hi JB, I went down this rabbit hole last week, here is a post I made summarizing what I found, with links to the dev's GH discussions of the different ideas for implementing the linking of communities, both within an instance or across instances, public or private, mod or user created. These features would likely be implemented separately.

There is also a link to a firefox extension that you may find useful while the dev work is ongoing.

See https://lemmy.ml/post/1615183

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