Is it possible to do contrast stretch only on blue channel in Darktable in a simmilar way like IMADJUST (Matlab: 1% saturation)?

I am trying to enhance a picture only on blue channel stretching the histogram. I know its possible to do it manually, but I want to apply it to several picture and it should be based on the brightness histogram of pixels like IMADJUST does it. Maybe someone has some experience? Its not suppose to look good, since the images are later being processed further.