IPv6 Static Route

[sdh91]

Could someone help me with the syntax on how to add a static route for IPv6?

I need to add a static route to a routerB below my ASUS router for IPv6, I have tried to do it but I'm not getting the syntax correct.

This is what I have so far.
route -A inet6 add fdc5:6e16:2f48:4864::/64 2606:XXXX:XXXX:0101::2

I've also tried route -A inet6 add fdc5:6e16:2f48:4864::/64 br0
Also tried route -A inet6 add fdc5:6e16:2f48:4864::/64 2606:XXXX:XXXX:0101::2 br0

IPv6 network below my router, let's say vlan 100 - fdc5:6e16:2f48:4864::/64
IPv6 address of my router is 2606:XXXX:XXXX:0101::1
IPv6 address of my second router is assigned to 2606:XXXX:XXXX:0101::2

If someone could just help me with the syntax if this is even possible would be really appreciated.