@Dipika Chowdhary If you are looking to transliterate script from non-Latin to Latin format then the response from the API would be in English i.e Latin script. The language support page displays the To/From indicator which means the script from Latin to Non-Latin is also possible. Here is an example for both the cases:
Hi->En i.e Deva->Latn
En->Hi i.e Latn->Deva
I hope this helps clarify the usage of the API.
If this answer helps, please feel free to accept the same as answer. Thanks!!