I know season 4 is in the making now last year during Disney SW convention the producers already talking about their story plan.

But seriously,Jon Favreu. How much money Disney is waving at you right now to milk the series to death? I'm big fan yes but damn it please please don't get blinded with success. You guys starting out great don't ruin the series by rushing it with so so plot and putting in more fillers.

https://ew.com/tv/the-mandalorian-jon-favre...ing%20fulfilled.

Darth Vader was one of the user AFAIK.
But here in this wiki seems like more Jedi knows and using it. It's one of earliest skill been taught to all young padawan during their training.
https://starwars.fandom.com/wiki/Force_barrier/Legends