input.json

{
  "country": [
    {
      "name": "country X",
      "region": [
        {
          "name": "north",
          "geo": [
            {
              "state": "xx",
              "name": "Northern State",
              "population": "100000"
            },
            {
              "state": "yy",
              "name": "Boreal State",
              "population": "2000"
            }
          ]
        },
        {
          "name": "South",
          "geo": [
            {
              "state": "aa",
              "name": "Southern State",
              "population": "200000"
            },
            {
              "state": "bb",
              "name": "Down under State",
              "population": "3000"
            }
          ]
        }
      ]
    },
    {
      "name": "country Y",
      "region": [
        {
          "name": "north a",
          "geo": [
            {
              "state": "xx",
              "name": "Northern State a",
              "population": "100000"
            },
            {
              "state": "yy",
              "name": "Boreal State a",
              "population": "2000"
            }
          ]
        },
        {
          "name": "South b",
          "geo": [
            {
              "state": "aa",
              "name": "Southern State b",
              "population": "200000"
            },
            {
              "state": "bb",
              "name": "Down under State b",
              "population": "3000"
            }
          ]
        }
      ]
    }
  ]
}