I am trying to create a scratch on a curved surface in Unity and would like to have digged in the object not bumped over the object using a normal map. How can I do it?

I tried to use an inversed normal map but didn't succeed. I also tried to research about CSG (Constructive Solid Geometry) but didn't try it yet and now I am looking into changing UV maps textures.

I expect to have a curved object with a small scratch digged into the object (inverse work of the normal map).

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