Darktable 2.4.3 and GIMP 2.10

Hi All, Darktable 2.4 came out a little while ago and GIMP 2.10 is hot off the press, and now that GIMP supports 32bit image depth it makes sense for them to work together. And, in fact, they should as GIMP, when confronted with a RAW file indicates that either Darktable or RAW Therapee can act as the RAW file processor. So how do I get them to work together? I was expecting a field in DarkTablepreferences saying "External Editor = GIMP" and in GIMP, something like "RAW image processing by Darktable".  But I have found nothing like these at all.  Any clues?? Please. Andrew Greig