How to include a Mozilla TTS voice into an app? SAPI, Android TTS module!?

My question is: how to include a voice from Mozilla TTS into an app? I think the best would be to have possibilities to somehow install them as SAPI voice in Windows or as a system-wide TTS Module on Android. Then they will also be usable via the WebSpeech API or in native apps. So if anyone has an idea how to install / convert these Mozilla voices to one of these standardized APIs (SAPI, Android TTS module), please help.