I have recently purchased TSW2 on Steam and I use to play on Xbox so I bought a lot of DLCs and I don't want to spend more money on stuff I already have I would love to see cross-progression in TSW2 you can use the dovetail account cant you or something I don't know how hard it is to add cross-progression but I'm just asking.
You are talking about the Xbox Play Anywhere program. It is not going to happen because that only works with the Microsoft Store (and even then, only for the games that are part of that program). Xbox is owned by Microsoft, so it only plays ball with the Microsoft Store.
