Can I crop to an exact size in Darktable?

I am trying Darktable for raw processing, and I want to crop an image to an exact size (e.g., 1280×720), specifying the content to retain by moving the rectangle around after it’s sized. This is pretty standard in most programs I’ve used (the X,Y+X+Y is usually listed with regular number inputs), but the only thing I can find in Darktable is an aspect ratio, which will helpfully lock the selection to 16:9 but not let me select a specific size.

Is there any way to input an exact size for a crop in Darktable?