如何在Vue JS中使用v-for将多维数组显示为一级选择选项

<template>
  <div>
    <select v-model="selectedOption">
      <option v-for="option in options" :key="option.id" :value="option.value">{{ option.label }}</option>
    </select>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedOption: '',
      options: [
        {
          id: 1,
          label: 'Option 1',
          value: 'option1',
          subOptions: [
            { id: 11, label: 'Sub Option 1', value: 'subOption1' },
            { id: 12, label: 'Sub Option 2', value: 'subOption2' }
          ]
        },
        {
          id: 2,
          label: 'Option 2',
          value: 'option2',
          subOptions: [
            { id: 21, label: 'Sub Option 3', value: 'subOption3' },
            { id: 22, label: 'Sub Option 4', value: 'subOption4' }
          ]
        }
      ]
    };
  }
};
</script>