a shader or decal that only renders the normal map

hello guys so i've trying to find a decal solution to make a bullet hole decal on a surface that only renders the normal map. i've been searching all over the place but there's no results that works with unity's built in render pipeline i found this but i don't really know how to set it up in my scene. apparently this effect works easily in unreal but no in unity

and here is the results i'm looking for any help would be great