How to clamp rotation of multi-rotation constraint (Animation Rigging)

Hello, I'm trying to get the character to aim using Inverse Kinematics (with Animation Rigging Package). But I have a problem, I can't clamp the rotation of the object which is rotating the arm.

Problem:

The hierarchy I set up is as follows, I placed the target and hint in the RightHandIK under the RigLayer_hands. I added my components on RightHandIK. RightHandIK facing AimLookAt object for horizontal and vertical movement. (I had a lot of jitter in the multi-aim constarint for some reason so I did this method)

My hierarchy and RightHandIK components:

I'm pretty happy with the arm rotation, but I couldn't figure out how to clamp it horizontally. I tried a few simple methods in script, but it did not make any changes to arm. In the videos I watched on youtube they only move vertically, when they rotate the camera for horizontal movement the character turns completely, but that's not what I want.

Is there any way I can clamp the rotation? Or is the path I'm taking completely wrong? What should I do to achieve this?