Rotate Arms with Camera?

More specifically, I want the hands of my fps character to be in the same place on the screen while looking up and down. I tried the Transform (Modify) Bone node from the Anim BP in many ways, but there is no local option, and I need the angle to be relative to the Yaw direction of the character.

Update- Im still stuck. I tried using world rotation and calculating what it should be, but no luck so far. ill keep posted!