gecko-dev/testing/mozharness/configs/test/test.json

{
  "log_name": "test",
  "log_dir": "test_logs",
  "log_to_console": false,
  "key1": "value1",
  "key2": "value2",
  "section1": {

    "subsection1": {
      "key1": "value1",
      "key2": "value2"
    },

    "subsection2": {
      "key1": "value1",
      "key2": "value2"
    }

  }
}