That's exactly what the Koenigsegg Regera does, it has three total electric motors in addition to the engine. The one in front of the engine is used as energy conversion and as a starter for the motor. There are two more electric motors on each axle for supplying the initial grunt, while the engine builds horsepower, supplementing the electric motor. The motors also aid in regenerative braking and torque vectoring. There is no transmission between the engine, electric motors and the wheels, relying only on a torque converter, using the entire rpm range of the engine from zed to 250 mph. In addition, the engine has no camshafts, relying on electronics and pneumatics for the intake and exhaust valves. And of course, it has two turbo chargers as well.