Custom fonts are not appearing in Navigator Pane

I have followed the procedure specified in https://doc.qt.io/qtdesignstudio/studio-fonts.html and in https://www.youtube.com/watch?v=Z3uPoe-4UAw
Fonts are loaded properly and can use them in my project also. But not able to have them in Navigator panel.

Have followed both the ways
to manually call them once from any QML file or add the font name to the Constants.qml file of the project, but not able to see fonts in the navigator pane.
Fonts are not available in the drop-down list of Font property too.
Attaching a simple project