The first public release of GrapheneOS Speech Services is now available in our App Store. After installing it, it can be activated as a text-to-speech service by tapping it in Settings > System > Lang...
It currently has a single voice for US English. If you have the system language set to anything other than English (United States), then you need to change Settings > System > Language & region > Speech > Text-to-speech output > Language to English (United States) from Use system language for now.
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