On the ASA, XLATE builds and connections are captured.
If you send syslog messages numbers 305009 through 305012 and/or 305013 through 305016 to a syslog server and save it, you can capture the data. Perhaps not in the easier form to deal with, but it is there and is searchable.
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...