@Muhammed Hafil I had reached out to the Product Owners internally and got a confirmation that in short term, there are no plans to add other languages. So, for now, only Python will be available in speech studio.
If there are any plans / updates in the future, it will be added in this article, which you can refer .
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Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.
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