AWS started publishing API models (in the Smithy JSON AST form) to the aws/api-models-aws GitHub repository which are also published to Maven Central.
https://aws.amazon.com/about-aws/whats-new/2025/06/open-source-aws-api-models
Not sure if that will be easier to use long term than extracting models from the AWS SDK for Java v2.
AWS started publishing API models (in the Smithy JSON AST form) to the aws/api-models-aws GitHub repository which are also published to Maven Central.
https://aws.amazon.com/about-aws/whats-new/2025/06/open-source-aws-api-models
Not sure if that will be easier to use long term than extracting models from the AWS SDK for Java v2.