<div id="app">
  <table>
    <tr v-for="(n, i) in Math.max(r1.length, r2.length)">
      <td>{{r1[i]}}</td>
      <td>{{r2[i]}}</td>
    </tr>
  </table>
  
</div>

const Test = {
  data() {
    return {
      r1: [1, 2, 3],
      r2: [4, 5]
    }
  },
}

Vue.createApp(Test).mount('#app')