{
  "nftables": [
    {
      "metainfo": {
        "version": "VERSION",
        "release_name": "RELEASE_NAME",
        "json_schema_version": 1
      }
    },
    {
      "table": {
        "family": "ip",
        "name": "x",
        "handle": 0
      }
    },
    {
      "chain": {
        "family": "ip",
        "table": "x",
        "name": "y",
        "handle": 0
      }
    },
    {
      "chain": {
        "family": "ip",
        "table": "x",
        "name": "z",
        "handle": 0
      }
    },
    {
      "map": {
        "family": "ip",
        "name": "mapping",
        "table": "x",
        "type": "ipv4_addr",
        "handle": 0,
        "map": "inet_service",
        "size": 65535,
        "flags": [
          "timeout",
          "dynamic"
        ]
      }
    },
    {
      "rule": {
        "family": "ip",
        "table": "x",
        "chain": "y",
        "handle": 0,
        "expr": [
          {
            "map": {
              "op": "update",
              "elem": {
                "payload": {
                  "protocol": "ip",
                  "field": "saddr"
                }
              },
              "data": {
                "payload": {
                  "protocol": "tcp",
                  "field": "sport"
                }
              },
              "map": "@mapping"
            }
          }
        ]
      }
    }
  ]
}