<el-table :data="tableData" stripe border>
  <el-table-column width="170" prop="id"></el-table-column>
  <el-table-column width="170">
    <template slot-scope="scope">
    <!-- -->
    </template>
  </el-table-column>

 </el-table>

tableData: [
   {
   "id":1,
   "nested": [{"name": "mike"}, {"name": "piter"}]
   },
   {
   "id":2,
   "nested": [{"name": "maria"}, {"name": "anna"}]
   },
  ]

  };