You can certainly do that as well.
In fact, you can completely disable the footer element of the theme so you could go all in on the Block Element with Grid blocks for all the footer layouts you want to do.
To disable the footer element the theme adds by default, you can use the Layout Element:
https://docs.generatepress.com/article/layout-element-overview/#disable-element
You can then add in as much layout as you want to the block element to your preference.