How can I use aim_offset pose animations with an avatar mask?

Hello friends!,
I recently purchased your pistol and rifle pro animation packages from the Motus Digital in Unity Asset Store. While using these animations, I couldn’t efficiently utilize the aim_offsets animations. When I create an avatar mask and use aim offsets, the upper body of the character moves strangely. Because aim_offset animations are in pose form, the upper body remains fixed during gameplay. It moves entirely based on the movement of the lower body, giving the impression of a bodybuilder who has never done any stretching exercises. How exactly should I use these aim offset animations? My goal is to make my TPS character aim up or down based on the mouse position while in motion. I dont want to use IK constraints.