ngFor-simple.html

<div *ngFor="let item of qaList;let qIndex= index;trackBy:customQTrackBy">
      <div class="card">
        <div class="card-header bg-info text-white h5">
          Q{{(qIndex+1) + '. ' + item.question.questionContent}}
        </div>
        <div class="row input-group">
           <textarea class="form-control" rows=2 name="questions-{{qIndex}}" [(ngModel)]="item.question.questionContent"
           #editQ="ngModel" required></textarea>
        .........
        ......
        ....
        <div *ngFor="let ans of item.answers;let aIndex= index;trackBy:customATrackBy">
                <div class="row">
                    <div class="col-1">
                    {{'A' + (aIndex + 1) + '. '}}
                    .........
                    ......
                    ....
        </div>
       </div>
</div>