Yes, Moto Z2 Play does have support for NFC.
Yes, it does have.
You will get one Style Mod free but you have to buy Camera mod, Battery mod, etc. if you want them.
Yes, Moto Z2 Play works perfectly fine with the Jio sim.
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.