如何在PrimeNg多选组件中显示某些列处于选中状态和某些列处于取消选中状态

<p-multiSelect [(ngModel)]="selectedColumns">
  <ng-template let-column pTemplate="item">
    <div class="checkbox">
      <label>
        <input type="checkbox" [ngModel]="column.isSelected" (ngModelChange)="toggleSelection(column.columnId)">
        {{column.columnId}}
      </label>
    </div>
  </ng-template>
</p-multiSelect>

toggleSelection(columnId: string) {
  const column = this.columns.find(c => c.columnId === columnId);
  if (column) {
    column.isSelected = !column.isSelected;
  }
}