Been trying to find some documentation in these places: * https://netfilter.org/projects/libnftnl/ * https://www.netfilter.org/documentation/ * https://git.netfilter.org/libnftnl/tree/ * https://wiki.nftables.org/wiki-nftables/index.php/Portal:DeveloperDocs/nftables_internals but either I missed it - and thus appreciate a pointer - or there is none? The aim/goal is to utilise libnftnl with json.