elementui中el-form-item鼠标悬停label,显示完整内容

 <el-form-item>
              <template #label>
                <el-tooltip :content="$t('plan.jichab')" placement="top">
                  <span>{{ $t('plan.jichab') }}</span>
                </el-tooltip>
              </template>
              <el-switch v-model="specialCauseTests.rbar.test_1_enabled" />
            </el-form-item>

css

::v-deep .el-form--label-top .el-form-item__label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-block;
  width: 100px;
}