element的下拉框和单选框组件都分别绑定key和value，但多选框组件官方给的例子只能绑定value数据

<template>
  <el-checkbox-group v-model="checkList">
    <el-checkbox label="复选框 A"></el-checkbox>
    <el-checkbox label="复选框 B"></el-checkbox>
    <el-checkbox label="复选框 C"></el-checkbox>
    <el-checkbox label="禁用" disabled></el-checkbox>
    <el-checkbox label="选中且禁用" disabled></el-checkbox>
  </el-checkbox-group>
</template>

<script>
  export default {
    data () {
      return {
        checkList: ['选中且禁用','复选框 A']
      };
    }
  };
</script>

比如我的数据结构是

[{"key":"1","value":"test1"},{"key":"2","value":"test2"}]

就不能用了，有什么办法解决