rojo/test-project/src/hello.model.json

{
  "Name": "hello",
  "ClassName": "Model",
  "Children": [
    {
      "Name": "Some Part",
      "ClassName": "Part",
      "Children": [],
      "Properties": {}
    },
    {
      "Name": "Some StringValue",
      "ClassName": "StringValue",
      "Children": [],
      "Properties": {
        "Value": {
          "Type": "String",
          "Value": "Hello, world!"
        }
      }
    }
  ],
  "Properties": {}
}