I am able to do header grouping and row grouping as in the documentation. However I am unable to group row cells for two or more columns. As in the attached screenshot, I want to implement the section for Sl. No. 2 (i.e. Cash Deposit), to have subcells or sub columns. I tried using "colSpan" inside "column" key but it has not effect, it is working only inside "header" key. How can I achieved it in KoolReport Table?