Automatically Use The UV

I have this shader that allows players to remove parts of a texture in runtime. The way it’s currently set up, I have to specify the UV mask of each model (I need to go to my 3D software, extract the UVS, go to my 2D software, paint the UVS white and the rest black, extract the mask…).

Is there a way to automatically get the mesh’s UVS as a white mask?