How to remake a radio-controlled model from an internal combustion engine to an electric motor
In theory, you need to install a driver for the engine (H-bridge, controller), connect the signal from the receiver of the control signal to its inputs. In practice, an electric motor (collector or BLDC), a battery, charging for it, possibly a receiver are bought for this. You may have to buy additional parts for the transmission. I can’t recommend models and stores, because I don’t deal with this issue, but the process is shown in this video, although it is short.
By the way, under the video there are links to what you need to order with aliexpress for such a rework!