T6679 added support for destination groups in NAT66, but it does not yet support source groups.
```
set nat destination rule 10 source
Possible completions:
address IP address, subnet, or range
fqdn Fully qualified domain name
> group Group
port Port number
```
```
set nat66 destination rule 10 source
Possible completions:
address IPv6 address or prefix to be translated
port Port number
```