In Batman: White Knight Presents - Generation Joker, Jack Napier's found a way of returning to life. Well, at least on a digital level. Joker's back as a hologram, taking his kids, Jackie and Bryce, on a road trip, so they can learn his story.
Source:https://www.cbr.com/batman-white-knight-generation-jokers-bryce-jackie-jokerz-gang/