Ipv6 prefix delegation.. how to assign ipv6 to lan clients when using DHCP-PD?

I know this is a new feature only in 1.3 rolling release recently, but are there any example configs for how to assign IPV6 addresses to LAN clients from an ipv6 prefix delegation that is dynamic from the ISP? most of the example configs I see assume a known static ipv6 range.
The DHCP-PD feature mentioned in the May 2020 update works fine for allocating addresses to my VyOS LAN interfaces when I connect with PPPOE… but I’m not sure how these ranges are passed on to LAN clients.

another self reply… after updating to the very latest 1.3 rolling release, and reading through thread in https://phabricator.vyos.net/T421 I got it working, thanks to the efforts of everyone making this happen!

Once I tidy it up I should post a cut down version of my config here…