vue-form表单带有二级标签如何展示

form带有二级标签如何展示

<el-form-item >
            <label slot="label" style="display:inline-block;line-height:20px;">
              剩余期限 <br/>
              <em>(含权)</em>
            </label>  
            <el-select
              v-model="poolSettingForm.symbol"
              style="width:88px;"
              clearable
              placeholder="请选择"
            >
              <el-option
                v-for="(item,index) in symbolList"
                :value="item"
                :key="index"
                :label="item"
              />
            </el-select>
            <xn-input-number
              style="width:93px; margin-left: 10px"
              v-model="poolSettingForm.deadline"
              :max="99"
              :min="0"
            /><span style="margin-left: 5px;">年</span>
          </el-form-item>