How to make the VR hands’ collision as complex shape which seperate each finger BUT not a shpere?

how to make the VR hands’ collision as complex shape which seperate each finger BUT not a shpere?
thanks!

so VR hands’ collision as complex shape which seperate each fingure;
meanwhile despite the presice Collision, I still want it be able to Grab ragdoll by Physics Handle and StaticMesh by AttachComponentToComponent, in order to do this, I NOW use SpereTrace which is just like a bounding sphere of the hand.
Is it good to keep these 2 shape working together?
OR is there other better way to do this? eg. don’t use Trace BUT use OnOverlap?

and I wonder that how to do other things besides collision, eg. grab. many demos do Grab using grips and maybe along with some Trace method whether lineTrace or SphereTrace. so if used SphereTrace, it will be very tricky to set the position and size of the Sphere, in order to do more things like Grab other than collision.
Or, is this Grab able to be realized by do things in OnOverlap…or some function responding events? maybe it’s much better than using Trace method.
thanks!