What is the best way to implement a frequency dependent voltage source in feko?

Hi, I am trying to simulate a frequency dependent voltage source in feko. Specifically I am simulating an antenna that has been calibrated according to iso-11451-2.

Which means I have a csv file of frequency points with associated voltage values that should describe the correct excitation for each point. This file was generated from measurements or previous simulations of a different feko model.

I want to simulate my antenna and target in such a way that I have correctly scaled nearfield and current and surface current values.

For a previous similar problem I used "create frequency ranges" and changed the power scaling for each resulting model by hand, but for my current situation there are too many frequency points.

I am looking for advice on how to provide that rescaling. I can not tell weather the scaling option in postfeko even allows such scaling. Or otherwise what is the best method to implement such a scaling in cadfeko? Is there an option I am missing?