Extending AB blocks

I’m wondering if your blocks are extendable using a methodology like this:
https://developer.www.ads-software.com/block-editor/tutorials/javascript/extending-the-block-editor/

My use case here is the ability to add a capability to your container block to allow for fixed-position backgrounds or full-height backgrounds. I can write CSS to make either of those work without changing any markup, but I want there to be a button to click to add the class to the section to make it work (rather than trusting that the end user will remember the specific class names to use).

If there’s another method I should be looking at instead, I’d be interested to see that as well!