it already is! if you have both tangia and vtspog open at the same time, tangia sends the tts over to vtspog to be played. Should work automatically~
as long as you have the tangia overlay open on obs/streamlabs desktop at the same time, tangia should send the tts over to vtspog . TTS setup must be done on tangias side, and when a tts from tangia is played, it will be played in vtspog instead. You can find our discord server link at the bottom of vtspog menu, if you are still having trouble feel free to come over to the server, make a thread in support showing whats your setup atm and we can see from there (much easier to check stuff there than in comments here)