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How to Add color RGB histogram in UE4 view as post process shaderin 4.24?

I know it’s been kind solved in 4.26, but I wanna know if there is a way to draw histogram chart as post process to analyze the view?

I think I find something like PostprocessHistogram.usf in engine folder but somehow I cant do #include"common.ush" in the custom node in material?
can anyone help me with this?