I think they’re actually planning on adding that soon, one of the devs mentioned it during their AMA that it’s one of the next big features they plan to try to tackle. (Edit: looks like the work is mostly done, it’s just under review github.com/LemmyNet/lemmy/pull/3869)
Also kbin already has it, but I prefer Lemmy’s UI much more so I just deal without having user instance blocking for now