The excellent and innovative Hook application provides a URL scheme which lets us
- Quickly obtain a Markdown link to any document or other resource,
Hook is in an early stage of its design journey, and I personally don't yet find that its pop-up window is always worth the trouble of fetching, using, and dismissing it, but, as usual, Keyboard Maestro comes to the rescue.
Hook may well add its own shortcut in due course, but here, in the meanwhile, is a basic approach to a single-key-stroke
Copy as (Hook) Markdown link, bypassing the manual summoning etc of the Hook popup window.
(for background, see https://discourse.hookproductivity.com/t/a-slightly-different-way-of-using-hook/826)