The R site has such a feature, which can allow one to group posts from many communities into one feed.
With many communities on different instances with similar topics, it’d be useful to group them to avoid separate visits to each community.
Does lemmy have such an option?
If not, are there any lemmy clients that can provides a similar option?
Or are there known workarounds, maybe with the rss feeds or so?
The quick and dirty way would be making a seperate community with a bot that automatically crossposts any post from those communities to the one you created.
But the good way would be a client side grouping feature where you can manually add communities to a subfeed.
I dont think there can be a universal solution, because there would have to be some sort of consensus as to how communities should be grouped.