Importing layouts greatly expands the flexibility of the Gutenberg Editor. If you have a favorite layout, you can import your designs from a different site using a JSON file. There are multiple copy/paste options including from Google Docs and the “Copy all Content” within the “More tools and options” menu.
Gutenberg Hub has an extensive collection of layout designs that you can fill with your own content. Easy as copy & paste. And EditorsKit allows drag/drop of a grouped block right into the editor.