[Vuejs]-How to acces my data and transform it into a table format

Your table markup should be as follows:

<template>
  <table>
    <thead>
      <th>
        Header
      </th>
    </thead>
    <tbody>
      <tr v-for="(x, index) in Arr" :key="index">
        <td>
          {{x.struct.extra.length}}
        </td>
      </tr>
    </tbody>
  </table>
</template>