As promised during the webinar, here is the link to the reply. Enjoy!
Can this be accomplished with my current RAD 10.2 ent. without CDATA products?
It should be technically possible by directly constructing HTTP requests to the service, or by extending Cloud API. I have been doing this Amazon SNS service (https://community.embarcadero.com/blogs/entry/my-amazon-web-services-programming-with-delphi-coderagex-session). Integrating with DynamoDB this way seems to be more complicated by most likely doable.
Check out more tips and tricks in this development video: