How to configure options props in vue's element-ui cascade selector tree

I want to change the key value of the data in the official website example, label,value,children equivalent

Mar.28,2021

read the document carefully: modify it through the props property

<el-cascader
  :options="options2"
  @active-item-change="handleItemChange"
  :props="props"
></el-cascader>


props: {
          value: 'label',
          children: 'cities'
        }
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