inventory plugins and host variables

I'm working on an enhancement to the cobbler ansible inventory plugin here:

https://github.com/ansible-collections/community.general/pull/6711

that would add an ip_address and/or ipv6_address host variable with the
primary IP address of the host in cobbler. Is that okay? Should it be
prefixed? Conditionally added with a plugin config? Not sure if there is any
standard or best practices among inventory plugins for this kind of thing.

Thanks,

Orion