Yes, Moto Z2 Play 64GB does support OTG.
Yes, it does support FM Radio.
Yes, it does support 4k Videos shooting as well playback.
Yes, Moto Z2 Play does have fingerprint sensor.
You do not have to do anything special to avail Jio offer on Moto Z2 Play. Just when you start using the mobile, insert your Jio sim and it will get activated by the Jio company itself.