Hello Bhumika,
Based on the screenshot, it looks like you're looking to setup the Audience source in the Google Ads account. It is not possible to setup the audience source through the API. However, you may refer to
this help center article on how to setup the audience source in the UI.
Unfortunately, there is no API method available which will help you creating the audience source in the account.
Let me know if you have any questions.
Regards,
Bharani, Google Ads API Team