Mega Menu Post Carousel



I want to make one of my menus Mega Menu that could display posts. Is it possible to convert a mega menu to widget area (not a single column but all four columns, as I believe 4 is maximum) and if that’s possible (so the widget takes all the mega menu space, width and height) then how to do it the best way?

If that could be possible then I’d put there some carousel widget and that’d be lovely.