Feature Req: Something like Apollos Multireddits - Lemmy.world

Really miss the Possibility to create custom feeds, containing different Subs (or communities). For example I had one that I called 3D Printing. When I chose it it was showing me posts from all the communities I added when creating it. So it made a feed containing posts on a specific topic over multiple communities. Especially here on Lemmy, where are some communities about the same topic spread over different instances that would make things a lot easier. Thanks for that great app btw!