Hi @guymc,
Sorry for the late reply. Right now it is not possible since it requires special integration with the Block editor. I’m planning for it in the future.
I can suggest a workaround for now.
You can build the blocks in a normal post, switch to the code editor, copy the HTML and paste it as shortcode content.
The challenge with this approach is that if you need to edit the code, then you need to do the same in reverse.
I’ll update once I’m able to add this feature to the plugin.
Thanks,
Aakash