PostProcessingStack(v2) StencilBuffer

Hi there.
Simple quastion, can use StencilBuffer with PostProcessingStack(v2)?
I use Built-in Render Pipeline.

What I want to do is make a PostProcessing that blends the specified image with the game screen and I don't want this CustomPostProcess to be applied to a particular object.
I've attached an image showing what I want to do as an explanation. (edited in Gimp)

I'm waiting for an answer. thenk you.

 

what happens if you try using the stencil buffer with the pps?
you have to use a custom effect to use it in any case but it doesnt sound too complex to set up a test case.