[Python] QQmlApplicationEngine failed to load component on Python

This problem is similar to QML module not found when using KDE Kirigami , but in this case, setting the QML_IMPORT_PATH env var before running the pyhton file doesn't solve the problem.

I have this simple application:

main.py

#!/usr/bin/python3

from PySide2.QtWidgets import *
from PySide2.QtGui import *
from PySide2.QtQml import QQmlApplicationEngine
from PySide2.QtCore import *

if __name__ == "__main__":
# Launch application
app = QApplication()
engine = QQmlApplicationEngine()
context = engine.rootContext()
engine.load("content/ui/main.qml")
if len(engine.rootObjects()) == 0:
quit()
win = engine.rootObjects()[0]
app.exec_()


main.qml

// Includes relevant modules used by the QML
import QtQuick 2.6
import QtQuick.Controls 2.0 as Controls
import QtQuick.Layouts 1.2
import org.kde.kirigami 2.13 as Kirigami

// Base element, provides basic features needed for all kirigami applications
Kirigami.ApplicationWindow {
// ID provides unique identifier to reference this element
id: root

// Window title
// i18nc is useful for adding context for translators, also lets strings be changed for different languages
title: i18nc("@title:window", "Hello World")

// Initial page to be loaded on app load
pageStack.initialPage: Kirigami.Page {

Controls.Label {
// Center label horizontally and vertically within parent element
anchors.centerIn: parent
text: i18n("Hello World!")
}
}
}


Before running it, I installed all the required dependencies as explained in https://develop.kde.org/docs/use/kirigami/introduction-getting_started/

sudo apt install build-essential extra-cmake-modules cmake qtbase5-dev qtdeclarative5-dev libqt5svg5-dev qtquickcontrols2-5-dev qml-module-org-kde-kirigami2 kirigami2-dev libkf5i18n-dev gettext libkf5coreaddons-dev qml-module-qtquick-layouts


The kirigami2 module is present at path

/usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kirigami.2


Btw, when executing the Python file I obtain

QQmlApplicationEngine failed to load component
file:///home/danieleverducci/git/KDE/python/prova-kirigami/content/ui/main.qml:5:1: module "org.kde.kirigami" is not installed


Setting the QML_IMPORT_PATH env var doesn't fix the problem. What am I overlooking?

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