How to I fetch all communities from a remote instance?

cross-posted from: https://lemmy.wiredentrypoint.xyz/post/29

this is a continuation of https://lemmy.ml/post/204080 (btw is there no way to tag this with a universal tag something like @lemmy.ml/c/meta/POSTIDHERE?)

So far i tried things like !.@lemmy.ml !@lemmy.ml but nothing works I can only search for a specific community