Currently there's no way to set to these languages since the language only supports ISO 639-1 (2 letter code) The translator agent also has the same issue where it cannot detect and set language properly https://botpress.com/blog/list-of-languages-supported-by-chatgpt However, chatgpt does support these languages Cantonese (Yue), China Mandarin, China Mandarin Chinese, China If limited to ISO639, you'd need at least 639-3 code Chinese zho Mandarin cmn Cantonese yue Southern Min nan Or perhaps use locale code instead like what most coding language does? zh-TW etc