default or selected kernelversion does not have config value CONFIG_NFT_RT.
Result is shown for kernelversion 6.7-rc3
Netfilter nf_tables routing module
modulename: nft_rt.ko
configname: CONFIG_NFT_RT
Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>Core Netfilter Configuration
└─>Netfilter nf_tables routing module
In linux kernel since version 4.1 (release Date: 2015-06-21)
This option adds the "rt" expression that you can use to match
packet routing information such as the packet nexthop.
packet routing information such as the packet nexthop.