docs: private static Properties extractProperties(JsonObject json, String fieldName) {
          Properties props = new Properties();
  
          // Extract any other grpc options
          JsonObject options = getJsonObject(json, fieldName);
          if (options != null) {
  
              for (Entry<String, JsonValue> entry : options.entrySet()) {
                  String key = entry.getKey();
                  JsonValue value = entry.getValue();
                  props.setProperty(key, getJsonValue(value));
              }
          }
          return props;
      }