How to use the @ckeditor/ckeditor5-ui/src/dropdown/utils.addToolbarToDropdown function in @ckeditor/ckeditor5-ui

const buttonView = componentFactory.create( 'highlight:' + option.model );

				// Update lastExecutedHighlight on execute.
				this.listenTo( buttonView, 'execute', () => dropdownView.buttonView.set( { lastExecuted: option.model } ) );

				return buttonView;
			} );

			// Make toolbar button enabled when any button in dropdown is enabled before adding separator and eraser.
			dropdownView.bind( 'isEnabled' ).toMany( buttons, 'isEnabled', ( ...areEnabled ) => areEnabled.some( isEnabled => isEnabled ) );

			// Add separator and eraser buttons to dropdown.
			buttons.push( new ToolbarSeparatorView() );
			buttons.push( componentFactory.create( 'removeHighlight' ) );

			addToolbarToDropdown( dropdownView, buttons );
			bindToolbarIconStyleToActiveColor( dropdownView );

			dropdownView.toolbarView.ariaLabel = t( 'Text highlight toolbar' );

			// Execute current action from dropdown's split button action button.
			splitButtonView.on( 'execute', () => {
				editor.execute( 'highlight', { value: splitButtonView.commandValue } );
				editor.editing.view.focus();
			} );

			// Returns active highlighter option depending on current command value.
			// If current is not set or it is the same as last execute this method will return the option key (like icon or color)
			// of last executed highlighter. Otherwise it will return option key for current one.
			function getActiveOption( current, key ) {
				const whichHighlighter = !current ||
				current === splitButtonView.lastExecuted ? splitButtonView.lastExecuted : current;

componentFactory.add( 'alignment', locale => {
			const dropdownView = createDropdown( locale );

			// Add existing alignment buttons to dropdown's toolbar.
			const buttons = options.map( option => componentFactory.create( `alignment:${ option }` ) );
			addToolbarToDropdown( dropdownView, buttons );

			// Configure dropdown properties an behavior.
			dropdownView.buttonView.set( {
				label: t( 'Text alignment' ),
				tooltip: true
			} );

			dropdownView.toolbarView.isVertical = true;
			dropdownView.toolbarView.ariaLabel = t( 'Text alignment toolbar' );

			dropdownView.extendTemplate( {
				attributes: {
					class: 'ck-alignment-dropdown'
				}
			} );