Use the Filters->Enhance->Noise Reduction in a script

[mwmuc]

Thanks for the quick answer. OS is Windows 10 or Linux Ubuntu 19.04.
So far I used "Filters -> Enhance -> Noise Reduction" because it has only one parameter (strength) and does the job beautifully for my files.
I will look into Q'MIC plugin's options for noise reduction in more detail.
It is clear already that they have lots of parameters.