Thank you for contacting Syncfusion support.
We have analyzed your requirement to show scroll bar only for the cell area and not to include headers. And we have not found any attachments regarding your expected result. So can you please confirm, whether your requirement is to achieve the image below,
If yes, we currently do not have support to display scroll bar as in the above image and we are validating the feasibility to achieve this requirement. We will update you with further details on 29th May,2019.
Also please let us know, if your requirement is different from the above.