how to define combo type in JSON format

I am using dhtmlxGrid, one of the column cell types as combo with different options of each cell, I am loding data through XML.

grid_ac.setHeader(“Nama,Semester,Grade”);
grid_ac.setColTypes(“ro,co,ro”);

data in XML format:

Semester I Semester II Semester III ....... Semester IV Semester V Semester VI ....... .......

Now i want to load data in JSON format, how to define it (combo type) ?

Unfortunately such feature is not available now, but we’re planning to add it in the future versions of the dhtmlxgrid.