Interpolation Curve

Hi all,
I need a custom curve for a scalar parameter in my material but I’m not a programmer and I’m looking for a program which let me to draw a curve on a graph and then, get the formula to write it in the material graph editor.
I didn’t find anything on the web to do that…

What I’m trying to do, is something like this : Material Editor, Custom Curve Interpolation - UE4 AnswerHub