Importing RBF in Unity (corrective blendshapes)

It's almost impossible to make good quality cutscenes without a proper rig. Some sort of corrective blendshape or corrective joints is needed for things like the elbow. Otherwise the meshes don't deform properly, no matter how good you skin them.
Most 3D apps have corrective blenshape. Here is unreal's:
https://docs.unrealengine.com/4.27/...keletalMeshAnimation/AnimPose/PoseDriverNode/
Obviously we can try to replicate the behaviour changing a blendshape's weight frame by frame depending on a target joint. Still, that's tricky and difficult to optimize. In any case I think it should be a Unity feature, and part of mechanim. Is there any plan to make Unity compatible with RBF? Or has anyone advanced in this field?
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