v-table & v-data-table static examples not working about node-red-dashboard HOT 2 OPEN

<template>
    <div v-for="item in desserts" :key="item.name">{{ item }}</div>
    <v-data-table>
        <thead>
            <tr>
                <th class="text-left">
                    Name
                </th>
                <th class="text-left">
                    Calories
                </th>
            </tr>
        </thead>
        <tbody>
            <tr v-for="item in desserts" :key="item?.name">
                <td>{{ item?.name }}</td>
                <td>{{ item?.calories }}</td>
            </tr>
        </tbody>
    </v-data-table>
</template>
<script>
  export default {
    data () {
        return {
          desserts:  [
            {
              name: 'Frozen Yogurt',
              calories: 159,
            },
            {
              name: 'Ice cream sandwich',
              calories: 237,
            },
            {
              name: 'Eclair',
              calories: 262,
            },
            {
              name: 'Cupcake',
              calories: 305,
            },
            {
              name: 'Gingerbread',
              calories: 356,
            },
            {
              name: 'Jelly bean',
              calories: 375,
            },
            {
              name: 'Lollipop',
              calories: 392,
            },
            {
              name: 'Honeycomb',
              calories: 408,
            },
            {
              name: 'Donut',
              calories: 452,
            },
            {
              name: 'KitKat',
              calories: 518,
            }
          ]
        }
    }
  }
</script>