We do not have any other formats other than mp3 for now. We will be adding other output formats soon as we are working on it.
If you want the output audio in a different format, you can always use a free online audio converter to convert the mp3 file to the required format.
You can simply download the MP3 on your PC and use a website like:
https://online-audio-converter.com/
Load your downloaded file there and convert it to another format.