Tooltip in a Grid – User Experience Stack Exchange

OK, so there is a grid. And a customer who wants a tooltip in this grid. To display 13 extra columns (I'm not kidding), and a few lines.

Please confirm that this tooltip usually displays a sentence. And a short to that.

I need to offer an alternative. "More" button? The additional information is essentially additional columns, of secondary importance compared to persistent columns.

Thank you for your advice.