{
  "nftables": [
    {
      "metainfo": {
        "version": "VERSION",
        "release_name": "RELEASE_NAME",
        "json_schema_version": 1
      }
    },
    {
      "table": {
        "family": "inet",
        "name": "x",
        "handle": 0
      }
    },
    {
      "chain": {
        "family": "inet",
        "table": "x",
        "name": "y",
        "handle": 0,
        "type": "nat",
        "hook": "prerouting",
        "prio": -100,
        "policy": "accept"
      }
    },
    {
      "map": {
        "family": "inet",
        "name": "z",
        "table": "x",
        "type": [
          "ipv4_addr",
          "inet_proto",
          "inet_service"
        ],
        "handle": 0,
        "map": [
          "ipv4_addr",
          "inet_service"
        ],
        "elem": [
          [
            {
              "concat": [
                "1.1.1.1",
                "tcp",
                20
              ]
            },
            {
              "concat": [
                "2.2.2.2",
                30
              ]
            }
          ]
        ]
      }
    },
    {
      "rule": {
        "family": "inet",
        "table": "x",
        "chain": "y",
        "handle": 0,
        "expr": [
          {
            "dnat": {
              "family": "ip",
              "addr": {
                "map": {
                  "key": {
                    "concat": [
                      {
                        "payload": {
                          "protocol": "ip",
                          "field": "saddr"
                        }
                      },
                      {
                        "payload": {
                          "protocol": "ip",
                          "field": "protocol"
                        }
                      },
                      {
                        "payload": {
                          "protocol": "tcp",
                          "field": "dport"
                        }
                      }
                    ]
                  },
                  "data": "@z"
                }
              }
            }
          }
        ]
      }
    }
  ]
}