client/cros/enterprise/extension_policy.json

{
    "VisibleStringPolicy": {
        "Value": "notsecret"
    },
    "SensitiveStringPolicy": {
        "Value": "secret"
    },
    "VisibleDictPolicy": {
      "Value": {
        "some_bool": true,
        "some_string": "notsecret"
      }
    },
    "SensitiveDictPolicy": {
        "Value": {
            "some_bool": true,
            "some_string": "secret"
        }
    }
}