Surely you'd need TTS for that one, too? Which one do you use, is it open weights?

Yeah, out of all the generative AI fields, voice generation at this point is like 95% there in its capability of producing convincing speech even with consumer level tech like ElevenLabs. That last 5% might not even be solvable currently, as it's those moments it gets the feeling, intonation or pronunciation wrong when the only context you give it is a text input, which is why everything purely automated tends to fall apart quite fast.

Especially voice cloning - the DRG Cortana Mission Control mod is one of the examples I like to use.