For the most part, it won't work. Ebike motors don't have devices intended to be radio receivers in them, so it's only circuits that are accidental receivers that will be sensitive.
Because it's accidental, it's only when there is bad design and very powerful signals that there will be circuits that are susceptible to radio transmissions.
There may be some models of ebike motor controllers with a particular vulnerability, but it won't work on all motor controllers, and the manufacturer would probably fix it if they knew about it to stop mobile phones from stopping their products from working.