NAT—PT is an IPv6-to-IPv4 translation mechanism, as defined in RFC 2765 and RFC 2766, that allows IPv6-only devices to communicate with IPv4-only devices and vice versa.
But you most likely don’t want it because you will lose information on the source IP address of the traffic. There is simply no way to cram a 128 bit source IP into a 32-bit field. So it will be hard to track down and report abuse.
You can get an IPv6/IPv4 tunnel, but you can’t NAT a v4 subnet to a v6 address. They’re different stacks and wholly incompatible with each other
It can be done, it’s called NAT-PT.
https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/15-mt/nat-15-mt-book/ip6-natpt.html.xml
https://ine.com/blog/2008-04-18-understanding-ipv6-nat-pt
But you most likely don’t want it because you will lose information on the source IP address of the traffic. There is simply no way to cram a 128 bit source IP into a 32-bit field. So it will be hard to track down and report abuse.