问在excel angular 4中导出数据时，Kendo angular网格添加静态列

EN

<kendo-excelexport [data]="excelData" [group]="groups" [filterable]="true" fileName="exceldata.xlsx" #excelexport>
    <kendo-excelexport-column title="title">
        <ng-template kendoExcelExportCellTemplate let-dataItem>
            {{dataItem.isTrue == 1 ? "title" }}
        </ng-template>
        <ng-template kendoExcelExportGroupFooterTemplate let-group="group" let-aggregates>
            <span> Total</span>
        </ng-template>
        <ng-template kendoExcelExportFooterTemplate let-column="column">
            <span>Grand Total</span>
        </ng-template>
    </kendo-excelexport-column>
</kendo-excelexport>