I mean, there kind of is. just like in reddit you could just type /r/subreddit, here you can type /c/community, and if you want it to link to a community on another instance its the obvious /c/community@instance which is now agnostic no matter which instance you find the post from.
edit: nvm, I thought that was how that worked, and looking at the lemmy issue tracker I thought that's what was suggested, but upon trying it, it doesn't seem to auto link like reddit does at all. so ๐คท