dessertHeaders: [
          { title: '', key: 'data-table-expand' },
          {
            title: 'Dessert (100g serving)',
            align: 'start',
            sortable: false,
            key: 'name',
          },
          { title: 'Calories', key: 'calories' },
          { title: 'Fat (g)', key: 'fat' },
          { title: 'Carbs (g)', key: 'carbs' },
          { title: 'Protein (g)', key: 'protein' },
          { title: 'Iron (%)', key: 'iron' },
        ],

See Demo