Nested JSON or Replicating Merged Cells

I am trying to recreate a report which is currently in EXCEL .

Here Currently, where ever there are Merged cells in a row in the EXCEL, is represented by
two rows in the Table grid With Same Values.

Is there is way to represent merged cells, Or combine cells or Nest a smaller json within a json.

I tried using a json object as a coloumn. saved the json i wish to nest inside a regular json. Upon representing the data in a json, it shows up as an Object.


Please guide.

When , The same data is displayed first by saving ina json control, then using its reference ina table grid, it appears like this,


Here, Prepackdetail, for PrepackdefID 10 should look like following.