IPoE Access- how can I achieve this?

Hello We are using IPoE as user access mechanism. The BNG/BRAS uses the option82 in the DHCP discover message and creates a username from that and passes this username to the radius server. All the users are in a postgres DB. We need to wall garden any user that is not in the DB when the radius servers looks at the DB tables. We require that any user that is not in the DB, the radius server should pass these attributes in access-accept packet to the client: 1) Filter-id 2) HW-Web-URL How can we achieve this please if this is possible? and where would we need to add the necessary policies? Kind regards Nitin Sidhu