I can't keep offset when i use (Copy Rotation) in bone constraints

I want to have constraint to work like Child Of, where constrained bone keep its rotation.

you should use local space->local space

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I get the right position with Local - Local, but the way it copy rotation is not what i wanted
Left: Copy Rotation with Local Local = Got rotations on locals
Right: Just parented with offset. = Got Global rotations (exactly what i needed in Copy Rotation)

I want to copy rotations and rotate them like if they were parented.