Customize shader properties for each terrain layer in unity

I want to develop a custom terrain shader using shader graph in unity.

Is it possible to control the terrain shader settings for each terrain layer?
So maybe I want triplanar shading to work on a specific terrain layer (cliffs) and not for each layer on the terrain.

Is it possible to have different shaders working for each terrain layer?
A snow shader can have different properties as opposed to a dirt layer shader or a grass layer shader or a sand layer shader.

I know one can wrap up those properties in a single shader but just want to know if it is possible?

How do I access my ‘custom terrain shader’ properties for each terrain layer?