How to use Apache Click + Cayenne + jqGrid?

Question

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Stumbled upon jqGrid www.trirand.com/blog/jqgrid/jqgrid.html. Actually from it grouping of lines on the field is required. In standard Click components, this is not the case, and they are actually meager compared to jqGrid. At the moment, all tables are processed by the standard Click table cayenne link, with all margin and formatting settings in Java code. To connect jqGrid, you will have to redo all this, and besides, you will probably have to abandon cayenne in favor of native SQL to generate json data for the jqGrid table. Since getting a selection into a list of objects, and then building json from objects is expensive. Who has experience with this? Are there ready-made solutions for this bundle?