From a pm:

when i am on lemmy.ml and enter !communism@lemmygrad.ml it generates [!communism@lemmygrad.ml](https://lemmygrad.ml/c/communism)

but i want the link to open on lemmy.ml so that someone on lemmy.ml who clicks it stays logged in and can subscribe, vote etc

really the link target for !communism@lemmygrad.ml has to be the local instance of the viewer, not the instance of the comment author