Azure VPN NAT (Network Address Translation) supports overlapping address spaces between customers on-premises branch networks and their Azure Virtual Networks. NAT can also enable business-to-business connectivity where address spaces are managed by different organizations and re-numbering networks is not possible.
VPN NAT preview provides support for 1:1 Static NAT. Check out the following documents for additional information.
NAT on Azure VPN Gateway.
How to configure NAT on Azure VPN Gateways.