metro4/docs/examples/ajax/data/select.json

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{
  "1": "Item 1",
  "2": "Item 2",
  "3": "Item 3",
  "Item group": {
    "1_1": "Item 1_1",
    "2_2": "Item 2_2",
    "3_3": "Item 3_3"
  }
}