Attach hand bone to component

My question is, how can I attatch a bone to a component through TwoBoneIK.

For example I want to attatch my hand bone to a box.
I need it to attatch my hand to the Vive MotionController.
I would be very glad if somebody have a simple screenshot of the Event and Anim Graph how to do this.

Thanks

Nobody any idea?
I have done this, but i don’t know how to go on.