Reddit reviews JRL 38T Sprocket Adapter Fit 1.5 inch 1 1/2 inch 415 Chain 49cc 50cc 66cc 80cc 2 Stroke Motorized Bike
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Fit:1.5 inch 1 1/2 inch 415 Chain 49cc 50cc 66cc 80cc Motorized BikePackage include:1 x 38T Multifunction Sprocket 1 x CNC Adapter 3 x ScrewPlease allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm)These items are just replacement parts, they are not original. Please confirm it before you make order.Match original equipment exactly for perfect fit, easy to install
Really the best way to do this is with a rear hub motor. I'm guessing your setup uses a mid drive motor.
You could use some parts made for gasoline bikes and add a second sprocket on the left side of the rear wheel, then the pedal-powered drive train would be unaffected.
Here's an example of the parts in referring to, it basically adds another sprocket to the other side of the rear wheel.
https://www.amazon.com/dp/B079QVWSYQ/ref=cm_sw_r_cp_apa_i_TFhXDbEKF3JAD