I just got a new Radrunner Plus. I am older and my balance isn't good so I was trying find stability wheels I could attach to help me ride. Used to be called training wheels
It might be possible but just keep in mind that ebikes are far heavier than a childrens bike so you'll want something very heavy duty. I just worry about relying too much on the training wheels. Perhaps a bike shop would be willing to take on the task for you.