[Vuejs]-How can I set correct index in Vue js for multidimensional array in template

<div class="row" v-for="(row, index) in myArray" :data-row="index" :key="index">
     <div class="item" v-for="(item, subindex) in row" :data-item="index*row.length+subindex" v-bind:key="subindex"></div>
</div>