{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "MyStruct",
  "type": "object",
  "properties": {
    "duration": {
      "$ref": "#/$defs/Duration"
    },
    "time": {
      "$ref": "#/$defs/SystemTime"
    }
  },
  "required": [
    "duration",
    "time"
  ],
  "$defs": {
    "Duration": {
      "type": "object",
      "properties": {
        "secs": {
          "type": "integer",
          "format": "uint64",
          "minimum": 0
        },
        "nanos": {
          "type": "integer",
          "format": "uint32",
          "minimum": 0
        }
      },
      "required": [
        "secs",
        "nanos"
      ]
    },
    "SystemTime": {
      "type": "object",
      "properties": {
        "secs_since_epoch": {
          "type": "integer",
          "format": "uint64",
          "minimum": 0
        },
        "nanos_since_epoch": {
          "type": "integer",
          "format": "uint32",
          "minimum": 0
        }
      },
      "required": [
        "secs_since_epoch",
        "nanos_since_epoch"
      ]
    }
  }
}