GridStack.setupDragIn('.gridstack-add-widget', {
      appendTo: '.gridstack-widget-dragged',
      helper: function (event: Partial<DragEvent>) {
        const id = nanoid();
        // ...
        // some code to store metadata of a widget based on its id
        // ...
        const target = event.target as GridItemHTMLElement;
        const clone = Utils.cloneNode(target.parentElement!);
        clone.setAttribute('gs-id', id);
        return clone;
      },
    });