https://courses.videoschool.com/courses/maya-3d-animation/lectures/9671310
"Bones" Head Blendshapes | Video School
Complete Guide to 3D Animation in Maya
video schoolbonesheadblendshapes
https://assetstore.unity.com/packages/tools/animation/skinning-to-blendshapes-107060
Skinning to BlendShapes | Animation Tools | Unity Asset Store
unity asset storeanimation toolsskinningblendshapes