I've posted another unit of Delphi Relax, with jqGrid support (the unit is RlxjqGrid.pas), added a specific demo and updated the documentation. This is the sample output:

The problem I had to face was to work around Delphi DataSnap REST Application support, as jgGrid passes HTTP params I had to "hide" and requires a "plain" JSON object as result, and not the structure used by Delphi. However, the actual server side code I had to use boils down to the following: