Just came along this documentation piece :)

https://github.com/WordPress/gutenberg/blob/trunk/docs/how-to-guides/curating-the-editor-experience/block-locking.md

Seems there was a feature added (apply to inner blocks) here:

• When locking a container block, offer option to lock all blocks within #40069 and
• Block Locking: Add the 'Apply to inner blocks' option #41876

maybe this could be added?

Thanks!