schema.json

[
  [
    [
      {
        "id": 1,
        "title": "row 1"
      }
    ]
  ],
  [
    [
      {
        "id": 2,
        "title": "row 2"
      }
    ]
  ],
  [
    [
      {
        "id": 3,
        "title": "row 3 col1"
      }
    ],
    [
      [
        [
          {
            "id": 31,
            "title": "row 3 col2  row1 col"
          }
        ]
      ],
      [
        [
          {
            "id": 32,
            "title": "row3 col2  row2 col"
          }
        ]
      ]
    ]
  ]
]