Get each bone BodySetup of specific skeletal mesh(or physics assets)?

I want to programaly change the size and location of each bone body setup (as in picture), and I managed to find BoneSetup class in python API.
However, I failed to get each bone of skeleton bone tree. ( I know there is ‘bone_tree’ BoneNode Array of Skeleton class, but it doesnt reference the Bodysetup)
Here is the logic ‘unreal_asset(SkeletalMesh)=>??=>??=>each BodySetup=>KAggregateGeom=>capsule array=>localtion change’. Can someone fill in?