Feature request: add flexbox into each grid

[flaneurette]

Feature request: Would be nice if we could add flexboxes inside of each grid, having both grid and flexbox design in-one. I envision this as having the option to add flexboxes in each grid row/col via a similar method of designing the grids. by selecting a grid and then clicking a new option to add flexboxes to them. Simplifying UX design even more. That would be stellar and a major feature.