JSON Data and Binary Data in API Gateway

Refer to this document on how to do this - https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-payload-encodings.html

If you want to configure from the console, you can look at the Settings under your API and if you scroll down all the way, it has a section "Binary Media Types" where you can specify which content types must be treated as binary.