At this time Kiro is a standalone product that does not require an AWS account at all. Kiro is powered by Bedrock behind the scenes, but it has a layer of abstraction between Kiro and Bedrock, which includes system prompts and additional functionality. I can definitely take this as a feature request though!
We really need to add some more step by step docs for setting this up, but it's very similar to the Amazon Q Developer integration with AWS IAM Identity Center if you are familiar with that: https://docs.aws.amazon.com/amazonq/latest/qdeveloper-ug/sec...