As you may be aware LineageOS 16 and above does not include PicoTTS.
This mean there is no Text-to-Speech integrated support.
This is now showing up on the /e/ Pie builds we are testing for upgrading our devices.
There is a feature request raised for this on Gitlab
Since this would be a good feature to have in the OS for users with special needs besides those of us who regularly use this feature we are looking at suggestions on best options available that provide good voice quality and has a decent language choice.
Do you have any recommendations for good Text-to-Speech options which can be added to the /e/OS ?