[Hand Tracking]way to get a hand position & rotation before build?

I use the new hand tracking feature and want to access to hands' transform before build. I tried LeftHandAnchor/RightHandAnchor to get the position and rotation, but the problem of it is it gives me the wrist position of a hand with hand tracking, while when hand tracking is off, it is the position of the center of the controller. Also, the anchor transform z+ isn't "forward", the direction an index finger faces to, but instead x+ is. Those just make it difficult to use the reference of hands transform.

There are a lot of cases you want to get the transform, such as when making sphere GameObject with its collider for OVRGrabber as a hand's child, or setting up the VRIK target etc. It should be easy. 

If I can access to hand prefab which has hand mesh, then maybe I can use it for the reference while making a project. But I didn't find one in the latest package. Please let me know if anyone finds the hand prefab, or a way to get the transform before build. Thanks.