This link is clickable on the Lemmy web interface, and will redirect you to the community within your own instance! It doesn't work in the Jerboa app, I don't know about other interfaces. Note that if your instance hasn't had any users interact with the linked community yet, you'll get a 404 error, and you'll have to manually search !community@instance.ml to federate them.
I used these quite a bit over on reddit, and they were reasonably popular. I'm hoping one or more reddit mods come over and want to take over moderating eventually.