injectCredentialsAndInvokeV2 method in proxy class doesn't support API's like PutObject from S3.

I have a use case where I am uploading a file to S3 during create/update but based on the current proxy implementation, I don't see a method that does this for me because putObject has request, content and a response, I am currently using https://github.com/aws-cloudformation/aws-cloudformation-resource-providers-cloudformation/pull/6/files/1e7ca3fc2d9223b7ac244ca08258991b4216e2b8#diff-30f8eb54f5522067f6dd253e609e9ca24d587dc9610e2b2c745383ec55cba68f AwsCredentialsExtractor to extract the credentials and make a putObject request.

I would like to know if you may be have any suggestions/workarounds for this?