jQuery Grid: how to render a column in a separate ajax call?

jQuery Grid: how to render a column in a separate ajax call?

I have a jQuery grid that has 3 columns. The grid is populated by a webservice call. The third column has to fetch data from the server based on the result of the first call. How to achieve this?

Currently, I am doing second ajax call in the renderer function, but unable to set the result of that call to the grid.