is it possible, to date, to use widgets? maybe using an extension? (the old topics that say it’s not possible date back to a few years ago.)
Yes, it is possible to do an extension.
But what kind of widget are you looking for?
You cannot inflate XML files in extensions.
Kodular is based on MIT App Inventor. As of now and what I know, there is no extension or component that gives the ability to create a widget. You will have to either develop an extension yourself or use Android Studio.
To open a screen when clicked, for example…