Why can't Mini Program get the outermost index? of the double loop?

 
 <label class="checkbox" wx:for="{{followNote}}" wx:key="{{item.id}}" wx:index="index" >
     <view wx:for="{{item.noteDetails}}" wx:key="{{item}}"
          bindtap="openFullTxt"
          data-index="{{index}}">
     </view>
</label>
Mar.12,2021
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