void QMetaObjectPublisher::handleMessage(const QJsonObject &message, QWebChannelAbstractTransport *transport)

{ ... /// message == \{"type":6,"object":"core","method":"receiveText","args":["123"],"id":3}

 

QVariant result = invokeMethod(object,
message.value(KEY_METHOD).toInt(-1), 
message.value(KEY_ARGS).toArray());

...

/// standalone project from https://code.qt.io/cgit/qt/qtwebchannel.git/