如何在Angular 7的数据透视表(Syncfusion Framework)中显示0？

import { Component, OnInit, ViewChild } from '@angular/core';
import { PivotViewModule, PivotViewComponent } from '@syncfusion/ej2-angular-pivotview';

@Component({
  selector: 'app-pivot',
  templateUrl: './pivot.component.html',
  styleUrls: ['./pivot.component.css']
})
export class PivotComponent implements OnInit {
  @ViewChild('pivotview')
  public pivotObj: PivotViewComponent;

  public dataSource: any;

  constructor() { }

  ngOnInit(): void {
    // 设置数据源，这里仅为示例数据
    this.dataSource = [
      { Product: 'A', Year: '2018', Sales: 100 },
      { Product: 'A', Year: '2019', Sales: 0 },
      { Product: 'B', Year: '2018', Sales: 50 },
      { Product: 'B', Year: '2019', Sales: 200 },
    ];
  }
}

<div style="width: 800px; height: 600px;">
  <ejs-pivotview #pivotview [dataSource]="dataSource"></ejs-pivotview>
</div>