It would require two Container Blocks.
The top container for the Full width image.
The second would contain a Grid Block, you can then use negative margins in the blocks setting > Spacing to pull the grid item over the top container.
This is brilliant thankyou, the plugin looks great – I didn’t know about it and am really pleased it’s by the same team as generate press – I’l be sure to check it out.
Out of interest, to aid my learning, what would you recommend if the content needed to be dynamic?