This is not a perfect method, but it may be better than nothing.
The approach is simple.
Just save the App Documentation as a “Webpage, Complete” type and manage it in a private GitHub repository.
I’ve tried saving in various file types, but the “Webpage, Complete” type seems to be the most suitable.
However, it does leave a noisy changelog like this one. If this were not the case, it would be more practical.
If anyone has tried a similar approach, I’d be happy to hear your thoughts on it.