how to completely disable ipv6 in debops

I'm facing a particular situation and I need ipv6 to be disabled. For this I use ipv6.disable=1 as kernel parameter at boot but I could even use - "net.ipv6.conf.all.disable_ipv6": True - "net.ipv6.conf.default.disable_ipv6": True - "net.ipv6.conf.lo.disable_ipv6": True in the sysctl.yml file. However the point is that roles like ferm are not aware that I've disabled ipv6. How can I make debops aware of the fact that I need ipv6 disabled for a specific host? Thanks Demetri