[Python] Pyside6-designer: custom promoted widget export Python code

I've created the design for a widget in PySide6 GUI.
This MetadataRenameEditWidget custom promoted widget is within a form that contains many other things.

I would like to get the class of the promoted widget so created, in order to create instances of it elsewhere in my code.

When I export the code for my Form, I get something like:

################################################################################
## Form generated from reading UI file 'main_window_uiERYisl.ui'
##
## Created by: Qt User Interface Compiler version 6.8.0
##
## WARNING! All changes made in this file will be lost when recompiling UI file!
################################################################################

from PySide6.QtCore import (QCoreApplication, QDate, QDateTime, QLocale,
QMetaObject, QObject, QPoint, QRect,
QSize, QTime, QUrl, Qt)

# More imports [...]

from metadatarenameeditwidget import MetadataRenameEditWidget


Where metadatarenameeditwidget is the module containing the widget, as I've promoted it.

However, the module metadatarenameeditwidget is not exported -- only the main_window.ui content is exported in a single file, and I cannot access the code of the promoted widget.

How can I export the code of the promoted widget?

Continue reading...