Value levels visualization for color ramp node

I’ve recently been thinking, it’s sometimes difficult to tell where the color levels are strongest when using the color ramp. In certain cases, it can require a lot of tweaking to find the perfect placement for color ramp points. I think it would be very helpful to have a little graph, similar to the one found in Gimp’s “color levels” dialogue. It shows you where on the color ramp the input colors are highest. It is very useful for quickly positioning the ramp values when doing color grading.

I can understand this being hard to do for materials and other procedural workflows, but it would be nice to have for compositing at the very least. Perhaps even with an option to collapse the graph for either performance or aesthetic reasons.