GridItem.vue

<template>
  <div>
    <slot></slot>
  </div>
</template>

<script>
export default {
  name: "GridItem",
  props: {
    x: {
      type: Number,
      required: true,
    },
    y: {
      type: Number,
      required: true,
    },
  },
};
</script>

<style scoped>
div {
  grid-column: v-bind(x) / span 1;
  grid-row: v-bind(y) / span 1;
}
</style>