Godot is open source. I'm sure, at least internally, Apple has tested these changes on one or more 'demo' apps. Any of which could be released as public demos.
If only had some sort of developer conference coming up in a little over a month. A conference where they release a bunch of demo and example projects. Well it's too bad no such thing exists.
Yes, Apple is a company that is famously known for publicly releasing demos and proofs of concepts; especially around games.