core/net/src/test/resources/org/onosproject/net/config/basics/device_annotation_config.json

{
  "devices" : {
    "of:0000000000000001" : {
      "annotations" : {
        "entries" : {
          "foo" : "bar",
          "empty" : null,
          "number" : 123
        }
      }
    }
  }
}