It depends on the year model. If you have a spoke magnet it's easy to turn the sensor around and mount it to the chain stay, put the magnet on the crank. Viole- instant 30mph bike if you can pedal that fast. You'll find you soon run out of gears.
For 2020 they moved the speed sensor to the hub, either replace the sensor, or get a speedbox that mounts inside the frame.
Sensor hack, I tried it out for a bit, then put it back to stock. Just doesn't gain that much. But then I'm US - so 32km limit. 25 would be a dealbreaker.