btw , could we add a feature to support tproxy when do pbr ?

sorry , I thought the function should be "match mark 2 and use route table 200" , there is some misunderstanding , but if I only want route based on the mark ,not to change it , how to do it ?

set policy route tproxy rule 100 mark '2'
set policy route tproxy rule 100 set table '200'

I think it depends on nftables , https://wiki.nftables.org/wiki-nftables/index.php/Matching_packet_metainformation#Matching_by_socket_UID_.2F_GID , it is first handled by nftables and mark , then use rule .