Loading indicator on a wizard nextAction()

I have this

                ])->nextAction(fn(ActionsAction $action) => $action->label('Next step')->icon('heroicon-m-chevron-double-right')->outlined(),)

                ])->nextAction(fn(ActionsAction $action) => $action->label('Next step')->icon('heroicon-m-chevron-double-right')->outlined(),)

and wanted to add a loading indicator when the wizard's next button is clicked ? I first thought of using the

->extraAttributes()

->extraAttributes()

but it doesn't rally makes sense . Any idea?