.ui compliaton with mnemonic from Designer

There are many issues about mnemonic

https://bugreports.qt.io/browse/QTBUG-17471?jql=text%20~%20%22mnemonic%22

Here is situation:

When we type in QT Designer in QTAbstracButton text eg. for chexbox `&1.checkbox` then in QT preview workin shortcut as alt+1. But when .ui is complited then this ampersand is not affected in any way in .ui

https://doc.qt.io/qtforpython/PySide2/QtWidgets/QCheckBox.html

". A shortcut key can be specified by preceding the preferred character with an ampersand. For example:

checkbox = QCheckBox("C&ase sensitive", self)

"

• this is no sense if we doing this in QT Designer.