mudguard:
If you get a tow could you shove the brakes on and get a bit of charge at the same time? Tow truck might not like it!!
If you are rope towing, you can. Start the car, and use regen like you would descending a hill, to recharge at 20 - 50kW (depending on speed and model of car). Of course, all this is drag directly added to the tow vehicle.
Plenty of Youtube videos showing this.
Of course, the brands advise against long wheels down towing (they didn't design the cars with infinitely long hill descents in mind), So commercial tow operators will lift the drive wheels of any EV being moved more than a few meters off the ground.