Found this by accident, it appeared in a google search.

Source: https://www.reddit.com/r/Enhancement/comments/14v5ss0/reslike_keyboard_shortcuts_for_lemmy/

https://github.com/vmavromatis/Lemmy-keyboard-navigation

I just wrote this for me. It was the only missing piece in order for me to move over to Lemmy. If anyone wants to use it (or improve it) feel free!

Navigation is pretty straightforward:

Down = Next post / comment Up = Previous post / comment Right = Next page / parent comment Left = Previous page / parent comment A = Upvote Z = Downvote X = Expand C = View Comments Enter = View Link