I submitted separate pull requests for the motion range and animgraph node:
https://github.com/EpicGames/UnrealEngine/pull/9747
https://github.com/EpicGames/UnrealEngine/pull/9748
I tried making everything as clean and backwards compatible as possible, although I’m not sure on the best practices in making animgraph nodes.
The bone rotations from the hand tracking plugin also don’t directly work with the hand model, so I added an adjustment for the joint axis. I’m not sure if there is a clean way of setting up the rotations, since OpenXR and Unreal has different axis handedness.