Live / on request means the voice exists; it is enabled on your licensed image when that language is in the contract.
POST /speak with English Kokoro is a leftover Garo demo. It is not Lemka TTS.Speech
TTS
Lemka text-to-speech. One voice per language, one endpoint.
Lemka TTS is the commercial synthesis stack. Language is in the path. Adding a language does not change the contract.