如何将[(ngModel)]分配给带有Angular和Materialize css的'selected‘选项的自定义多选？

<div class="input-field">
  <select id="customSelect" multiple [(ngModel)]="selectedOptions">
    <option value="option1">Option 1</option>
    <option value="option2">Option 2</option>
    <option value="option3">Option 3</option>
    <!-- 其他选项 -->
  </select>
  <label for="customSelect">Custom Select</label>
</div>

selectedOptions: string[] = [];

ngOnInit() {
  this.selectedOptions = ['option1', 'option2']; // 设置初始选中的选项
}

ngAfterViewInit() {
  const customSelect = document.getElementById('customSelect');
  M.FormSelect.init(customSelect, {
    // 可以根据需要进行其他配置
  });
  this.updateSelectedOptions();
}

updateSelectedOptions() {
  const customSelect = document.getElementById('customSelect');
  const instance = M.FormSelect.getInstance(customSelect);
  instance.getSelectedValues().forEach(value => {
    const option = document.querySelector(`option[value="${value}"]`);
    option.setAttribute('selected', 'selected');
  });
}