Color Histogram of Channels
Just like the histogram you see when adding a levels effect on a passthrough layer. I'd like to see my colors (basecolor) and grey values (height, roughness and metallic), while editing them.
The reason for this is simple. I know where I want the levels to be but it's hard to judge the precise value by just viewing the screen. If I want a roughness to range between .1 and .5. I want to be able to see that in the viewport (like an overlay you can toggle. Now everytime I want to check my values I have to make a levels and guess the exact value.