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if you’re ADS, you’re in first person, then there’s nothing to turn. (unless you have an advanced VR ARMA-style setup where the player’s body is separate from their head / cam and rotates independently; also, MechWarrior-style controls)
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if you’re using a 3rd person, there’s no ADS but perhaps some sort of zoom instead? That’s unless you’re flipping cameras from 1st to 3rd, that is. Do you want an over-the-shoulder camera, like in the Mass Effect series / 3rd person shooters? Where focusing on the target changes the way the player camera moves. Like in GTA?
You will need to clarify in detail what’s needed.