Constructing a function with imaginary numbers

[pamputt]

Eight years ago, @moneta wrote

Contour Integration over complex function

Hi, Complex mathematical function and also their integration in the complex space is not currently supported in ROOT. You might need to use a software package like Mathematica, Best Regards Lorenzo

I had a look on JIRA but I did not find any ticket asking for such feature. Maybe, it is time to open one in order to keep a track of this need.