Idea Summary
It would be great if there was an option to specify a page item in the Interactive Grid attributes, to specify a page item to store the selected rows in the interactive grid.
Use Case
You may want to filter a chart, or a separate report on the page based on the selections. To be able to have row selections automatically add the relevant identifiers into a page item, to which a dynamic action could be attached would be a great time saver. Ideally you would have options to specify which column in the underlying interactive grid is the ID, if there is no primary key specified.