I can't replace column rep.offilneURL with rep.reportcontrol.fieldname?

1

I try to replace rep.offilneURL with rep.[repcon.fieldName] but it not working .

repcon.fieldName return offilneURL inside command Type=1

on component.html

<ng-container *ngFor="let repcon of ReportControl">

 <div *ngIf="coln==repcon.fieldName">

  <div *ngIf="repcon.columnType==1">

   <a (click)="goToLink(rep.offilneURL)"></a>
   // replace rep.offilne by repcon.fieldName although repcon.fieldName return offilneURL
   // repcon.fieldname=offilneURL
    </div>
    </div>
  </ng-container>

report control as bove return below json :

report control is [{"reportId":2028,"fieldName":"offilneURL","reportStatus":"Icon","columnType":1},{"reportId":2028,"fieldName":"onlineURL","reportStatus":"Hidden","columnType":2}]