No, it is not possible to recharge the ebike by pedaling. 

The reason is because regeneration demands heavy push to pedal, which is exhausting. Regeneration only makes sense when you use the kinetic energy of a bike in breaking or descending a downhill, which at best it can increase the range by 10%. The idea of regenerative braking doesn’t work well on bikes because unlike cars the mass/aerodynamic loss ratio is too small.

We can have our system regenerate by locking up the clutch; but it loses the free-wheeling feature which is a big trade off.