I agree 100%. I would never jump start anybody with my Niro. Read too many horror stories on Prius Chat when I owned my Prius.I don't know the answer, but I do know that I wouldn't jumpstart another car with my Niro even if I could. Too much chance for it to f*** up my own electrical system in the process.
Ever since I started owning modern cars (with ECUs), I politely decline to offer a jump starts to strangers when they ask me for one, and explain that "last time I did that, it fried my ECU, sorry. I'll happily place a call to a roadside assistance company if you'd like."
If you frequently find yourself needing to jumpstart cars, I recommend buying a portable jumpstarter and keeping it in your car instead.