Manually add routes to FRRouting?

Hi. I'm setting up a ocserv VPN server on a CentOS box which will have a number of different subnets for different groups. The VPN access works and when I manually add routes from our (VyOS) router to the ocserv box the traffic to the different subnets flows correctly. However, I thought that adding OSPF on the ocserv box would make adding subsequent groups easier so I set up frrouting on the ocserv box.

The ocserv box and the VyOS router see each other as full neighbors but I have no idea how to add the VPN client subnets to the local routing table in the OS of the ocserv box, for redistribution with OSPF.

Does anybody have any pointers?