Question Add Fog to a shader

How can I add a "fog" (a plain color not affected by speculars, polygon orientation, lights,...) inside a surface metallic shader that I can control with a 0 to 1 value? It is possible inside shader graph? or a I need to create a custom shader (That I don't know actually) or a frament output? impossible?

Thanks

 

I don't see this as an option in 2021.3, while it definitely should be.
You can calc the distance from view/camera postion to the position of the object and lerp to fog color that way