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Yes, Samsung Galaxy A70 have Corning Gorilla Glass Protection.
You can see detailed specs here: Samsung Galaxy A70
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You don't need to enable VoLTE. Insert the Jio (VoLTE enabled) in any slot. By default, VoLTE will be active. If it is not, you can change the network preferences from Network option in settings.
Alternatively, you can follow a much easier way:
Reliance Jio works on VoLTE technology and VoLTE works on Bands 3, 5 and 40. Since Samsung Galaxy A70supports band 3 and 40, it also supports Reliance Jio SIM. You can use Jio SIM in both the SIM slots on the Samsung Galaxy A70.
Specs: Samsung Galaxy A70