@Override
  public JsonObjectBuilder getJsonObjectBuilder() {
    return super.getJsonObjectBuilder()
      .add("label", this.label)
      .add("protocol", this.protocol)
      .add("dataChannelIdentifier", this.dataChannelIdentifier)
      .add("state", this.state)
      .add("messagesSent", this.messagesSent)
      .add("bytesSent", this.bytesSent)
      .add("messagesReceived", this.messagesReceived)
      .add("bytesReceived", this.bytesReceived);
  }
RTCDataChannelStats, with attributes label, protocol, dataChannelIdentifier, state, messagesSent, bytesSent,
messagesReceived, bytesReceived
KITE-Framework/src/main/java/org/webrtc/kite/stats/rtc/RTCDataChannelStats.java