I selected Configuration-->Firewall-->Access Rules
Then, there is a pane on the right-hand-side of the screen that says "Addresses" and you can press the "+Add" button and add network object groups. I tried your example and ASDM generated the following config code:
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...