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.
Moto Z2 Play has nano sized sim card slots.
No. Moto Z2 Play does not have IR blaster sensor.
No. Moto Z2 Play comes with nonremovable battery.
Yes, Moto Z2 Play does have the memory card slot.