Hello Chandra,
NG mVPN is not listed in the datasheet for IOS XE for the ASR 920 platform:
see
https://www.cisco.com/c/en/us/products/collateral/routers/asr-920-series-aggregation-services-router/datasheet-c78-732079.html
The device has different licenses possible but only MPLS L3 unicast VPN and VPLS are listed.
You could try to check with feature navigator.
It is a platform for access/edge focused on metro ethernet with timing options for ethernet.
Edit:
I have made a search on feature navigator looking for feature MLDP-Based MVPN see
https://cfn.cloudapps.cisco.com/ITDIT/CFN/Dispatch?act=featdesc&task=display&featureId=7457
and only ASR 1000 and ISR 4400 appear depending on IOS XE versions
so ASR 920 and ASR 903 should not support NG mVPN.
Hope to help
Giuseppe