Question How to add a cel / toon shader to a urp 3D project?

I'm new to unity and I've been frustrated for the last 5 days, I'm trying to apply a toon / cel shader to my object which I've imported from blender. It already has a default material called "Player Material" which stores the texture of the mesh as imported from blender.

How do I add a separate material on top which simply "toon's" the object without having to do anything extra to the already existing materials and other properties ?



Note: All youtube tutorials, docs, articles have shaders of single color or (at best) have to import the texture image into that shader directly.

Things I've tried but didn't work due to previously mentioned reasons:

https://docs.unity3d.com/Packages/com.unity.toonshader@0.9/manual/index.html