RADIUS IPv6 accounting

Hello.

I’m using an RB433 and I’m making tests with PPPoE. Authentication and accounting is done with an remote RADIUS server. I’m working also on the IPv6 transition with PPPv6 and DHCPv6-PD.
I’ve managed to get it working on a testbed environment. Currently, the IPv4 addresses are sent to the RADIUS server, but not the IPv6 ones (Delegated prefixes and PPPv6 prefix).

Is it possible to enable RADIUS IPv6 accounting? Or, even better, to send fixed PPPv6 and PD prefixes (not pool names) from the RADIUS server?
RouterOS version is 5.9.

Thanks in advance,
Ygor