The game is getting better about it, but the other reason you'd want to group to find a player is to help force the same phase/instance.
The closest you can get would be to inject coordinates into chat -- either plain text or as a link -- and parse it out that way. Of course, you'd both have to have the addon for that, and the addon can't send the chat messages itself -- it'd have to copy the message in there for the player to send the message.
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