Decals with texture atlases

Hello, I can use decals when I only have one decal per channel, but I don’t understand how I can use them with a texture atlas. How can I ask to Unreal to only project the decal in a specific uv range an not the whole texture atlas ?

Does someone have an example of the Material I have to use with the decal system to do this ?

Thanks ;).

would also love to know this, +1