elementUI的el-table组件标题后面加图标

<el-table-column label="综合得分" align="right" prop="score">
        <template slot="header" slot-scope="scope">
          <span>综合得分</span>
          <el-tooltip
            class="item question"
            effect="dark"
            content="平均分。"
            placement="top-start"
          >
            <i class="el-icon-question"></i>
          </el-tooltip>
        </template>
        <template slot-scope="scope">
          <span>{
    
    {
    
     scope.row.score }}</span>
        </template>
      </el-table-column>