QtCreator - show python or c++ based qml components in visual editor

[lollypolly]

Is that possible to show python-based qml components in visual editor?
Lets assume I have following component:

class QmlQImage(QQuickPaintedItem):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.image_val = QImage()

    def get_image(self):
        return self.image_val

    def set_image(self, val):
        self.image_val = val

    image = Property(int, get_image, set_image)

    def paint(self, painter: PySide2.QtGui.QPainter):
        painter.drawImage(QRect(0, 0, painter.device().height(), painter.device().width()), self.image_val)

qmlRegisterType(QmlQImage, 'QmlExt', 1, 0, 'QmlQImage')

and qml file

import QtQuick 2.0
import QmlExt 1.0

QmlQImage {
    width: 256; height: 256
}

When trying to edit that qml file I am observing following error:

Also, is that possible to display c++ based components in QML editor? If yes, can someone provide link how to achieve that?

Thanks in advance.