Hi Rogelio,
We checked your requirement to set the right alignment for GridTableSummary. By default, the text is aligned in the right for the TableSummary.
We have prepared the sample as per your requirement, you can download the same from the below link.
We checked the screenshot shared by you in which you got the left alignment, you can refer the above sample to get the right alignment in the TableSummary.
Regards,
Vigneshkumar R