Link for new DM / personal chat message with pre-filled information

Continuing the discussion from Create a link to start a new personal message with pre-filled information:

I’d love to be able to have a URL that I could give to people, or easily put into a theme component, where if they clicked it, it would start a personal chat with that person or it would continue an already ongoing personal chat.

Is this something that currently exists?

If not, would others want this as well?