I'm sure it could be done, but I've never seen it done. Definitely would be a first. I would probably use some sort of barbed plastic fitting, then shape it to the contour of the underside of the sink (where the hole you drill is), and epoxy in place with something compatible to the sink plastic. Barbed fitting because I'm assuming you'd use some sort of hose to tie into the dishwasher drain fitting. Only fitting I can think of right now has barbed one end for a hose, NPT on the other. I'm sure I could find something at HD or Lowes that would work.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.