Grain in Zdepth

this might be a very simple question.
I like to add grain to blurry area of Zdepth. similar to the to"lens tool" in photoshop. where you can add the Zdepth in alpha and add grain on the fly as well
In Nuke I used a shuffle copy to get my Zdepth to work. but the grain tool in Nuke doesn’t have an alpha feed in it ?
thanks
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