QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml"))); //падает при выполнении этой сточки

QObject *rootObject = engine.rootObjects().first();
QObject *chat = rootObject->findChild<QObject*>("chat");

QVariant text2 = chat->property("text");
qDebug() << chat->setProperty("text", text2.toString() + "ntest");

Text {
    id: chat
    objectName: "chat"
    width: 689
    height: 378
    color: "#cdcccc"
    text: qsTr("Dialog started at " + time)
    leftPadding: 2
    wrapMode: Text.WrapAnywhere
    font.pixelSize: 18
}