RA Second Subnet / Gateway

[Com DAC]

I've currently got a second /64 subnet and have defined a route/gateway in pfsense to redirect all traffic on that subnet to the second gateway. Is there a way to use RA to advertise the second gateway and it's subnet so the traffic for that subnet doesn't have to all flow through pfsense? (the second /64 subnet is for ipv6 on vpn clients).

Thank you,