Hi Tuariq Beg,
Greetings from Syncfusion support.
We have prepared a sample with remote data and increased
the indent space by adding a span element before the needed cells. The
modifications are adopted from the forum as you shared for local data.
The modifications have been done to the sample and attached. Kindly use it for
you reference.
Sample : https://stackblitz.com/edit/angular-reuy9k?file=src%2Fapp.component.ts
Screenshot:-

If your sample differs from the sample we have shared,
kindly share a simple issue replicable sample or try replicating the issue from
the shared sample.
We are happy to assist you further.
Regards,
Vasu P.