Creating Qml from pyside

[Lirik]

Hello. Is it possible to create qml widget(with his own qml file) from python code inside another qml widget (which already exists in qml file)?
I'm using Pyside6

And second part:
I'm trying also set current StackView widget rom python-code.
I found this widget by .findChild(), but I've got an error:
'PySide6.QtQuick.QQuickItem' object has no attribute 'setCurrentWidget'