@ab49a4fb…b5e27f91 They likely have a dependency on Google Speech Services for speech-to-text. Have you tried installing it in the same profile?
GrapheneOS is going to be adding our own text-to-speech implementation bundled with the OS soon. The code is available on GitHub already but not bundled yet. We plan to make our own speech-to-text too. In the meantime, there are multiple options for both. Some apps may need Google's STT for now though.