sysconfig

Context: I'm using an up-to-date rocky linux 9 container template on Proxmox 7.2-1. What I'm trying to achieve is to set an IPv6 token for the container. I know this is possible, because if i add IPV6_TOKEN=::[TOKEN] to /etc/sysconfig/network-scripts/ifcfg-eth0 and do a systemctl restart...