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DataManager connection with custom backend data

Hello! Could you help me to clarify?
I am trying to connect my backend API with WebApiAdaptor;
The connection works fine, the request gives the data successfully, but the TreeGrid isn't rendered any data from BE side. 

Here my code examples; on view: 

<ng-container>

  <ejs-treegrid #treegrid [dataSource]='tableData'
                height='100vh'
                [pageSettings]="{pageSize: 30, pageCount: 1}"
                [enableInfiniteScrolling]="true"
                (actionBegin)="getNewPage($event)"
                [treeColumnIndex]='1'
                allowPaging='false'>

  <e-columns>
      <e-column
        field='serialNumber'
        headerText='serialNumber'
        width='120'
        textAlign='Center'>
      </e-column>
      <e-column
        field='description'
        headerText='description'
        width='50'>
      </e-column>
      <e-column
        field='companyName'
        headerText='companyName'
        width='50'>
      </e-column>
      <e-column
        field='employeeName'
        headerText='employeeName'
        width='100'>
      </e-column>
    </e-columns>
  </ejs-treegrid>
</ng-container>

on component: 

ngOnInit(): void {
  this.tableData = new DataManager({url: `http://localhost:3000/table-data/?&dataId=${this.storageService.getTableDataId()}`, adaptor: new  WebApiAdaptor, crossDomain: true })
}

data what my BE sends: 

  1. {
    count: number;
    dataId: string:
    rows: object[];
    }

I suppose that I missed some mandatory fields for WebApiAdaptor? Do I have to change response data from BE? Maybe you could notice what I am doing wrong?