A common Darktable approach is to use the white balance module. Set its preset to spot, then sample an area that should be neutral gray or white. This lets Darktable estimate and remove the cast from that reference area. For best results, select only a truly neutral area rather than the default large selection, and avoid clipped highlights because they can skew the calculation.

If you want a more manual, channel-style correction, try the color balance module. It can be used for manual color correction when you want more control than automatic white balance. If you don’t see it, enable it from more modules.