No, this isn’t attainable based on the FAQ:
Are customized Video games accessible utilizing the API? Can I exploit the API to create them?
No, creating and controlling customized video games is just not attainable with the API. Nonetheless, knowledge from customized video games performed throughout the final two weeks is on the market. Customized matches will present up alongside regular matches and they’ll have the attribute “isCustomMatch” set to “true”.