Method QWidget::createWindowContainer and background

[SHRED4RED]

I want to make Label with icon and text and a transparent background:
qml file:

Item {
property alias labelText: label.text

    Image {
        id: pic
        source: "qrc:/../../Desktop/avatar.png"
    }

    Label {
        id: label
        text: "This text should change... This text should change... This text should change... This text should change... This text should change..."
        width: 200
        textFormat: "RichText"
        color: "red"
        font.pixelSize: 12
        anchors.left: pic.right
        anchors.leftMargin: 10
        wrapMode: Text.Wrap
        background: Rectangle
        {
            color: "black"
            radius: 5
        }
    }
}

cpp:

QQuickView* view = new QQuickView();

QWidget* container = QWidget::createWindowContainer(view, ui->centralWidget);
container->setMinimumSize(320,80);
container->setMaximumSize(320,80);
container->setStyleSheet("QWidget {background-color: rgb(23,58,104)}");

view->setSource(QUrl("qrc:/MsgLabel.qml"));

ui->verticalLayout->addWidget(container);

I try change background color of widget but nothing... How to make transparent background (white area is bad)?

[SHRED4RED]

found such a solution:

QQuickWidget* qq = new QQuickWidget(QUrl("qrc:/MsgLabel.qml"), ui->widget);
qq->resize(320,80);
qq->setAttribute(Qt::WA_AlwaysStackOnTop);
qq->setClearColor(Qt::transparent);
ui->verticalLayout_2->addWidget(qq, 0 , Qt::AlignBottom | Qt::AlignLeft);