Why Obi-Wan couldn't Force Heal but Rey Can ? 1

In Star Wars Episode 9 The Rise of Skywalker (which is entering it’s 4th week out) showed some new force powers. One in particular which confuses myself and many fans, is force healing. When Rey healed the snake and then Kylo Ren, it brought some questions regarding the rest of the Jedi in Star Wars prequels and originals. Why didn’t Anakin heal his mother? Why didn’t Obi-Wan heal Qui-Gon Jinn? Why didn’t Luke heal Vader? Did they not possess this power? Why not? Or if they did, why couldn’t they use it?

Por Diego