Tunnel backups: QEMU-PC to hap-ac2

Tunnel backups: pc-supernode to hap-ac2 supernode

My pc-supernode /etc/config.mesh/wireguard contains:
config network
option start '172.30.7.180'

My hap-ac2-supernode does not contain that config line.
Assuming I move my wireguard tunnels from my pc-sn to my ac2-sn,
how do I tell my hap-ac2-sn to
config network
option start '172.30.7.180' ?

73, Chuck