Thanks very much for your response.
Yes After some research, I did the same thing which you have mentioned. The difference is I have made static NAT.
Here, I have one question. May be it is silly but what we need to put in IPv6-server address (Destination Field). So IPv6 address has any relation with IPv4 address.
IPv6 address should be made from ipv4 address ?
My flow will be like
Any source address (ipv6) from outside --> hits to IPv6 address --> source IPv6 address will be translated to IPv4 address (Embeded range) --> Destination IPv6 address will be translated to IPv4 address 18.104.22.168
Please let me know if I am missing anything.