You may have to go outside of the data grids themselves to achieve this. Instead you could create a non-persistent entity to hold your search query & display on the page with a search bar (theres one in the app store that you can tie microflow to search action). Then when user initiate search you retrieve all the objects that meet the search criteria via microflow and display them in a grid. I’ve done this before by associating the search results to my search entity and put the resulting data grid source as an xpath/association that reflects that. Hope that helps.