How to hide Spreadsheet Headers in Drilldown popup ?

Hi Team,
 
I want to hide the spreadsheet headers in the drill down details popup.
I have configured as below, spreadsheet headers got hided in pivot, but remains same in the drill down details.Please refer the screenshot.

 "options": {
        "viewType": "grid",
        "grid": {
            "showHeaders": false
        }
}

Thanks.