I couldn't find any docs for it besides basic functionality which is really bad in my opinion. Even the readme.md on github was basically the same as the description in pypi.
accessibleoutputs2 does not support linux now. It wants to install espeak module which is not available in python3 version. Remake it to use speechd instead of espeak.
I use plain old accessible_output2 from pip and stick it in a virtual environment. Then, I cd into /usr/lib/python3.10/site-packages and copy the speechd packages to the site packages directory of the virtual environment.