My name is Trong, I'm a developer with the team that developed the Amazon DynamoDB connector. Firstly, thank you for providing detailed feedback about your experience with our Amazon DynamoDB Connector.
Your observation is correct; as of the current version, the connector's supports Long, Decimal, String, and Boolean attributes. The implementation for a List/Map attribute, especially with its child nodes, is one feature that our connector presently does not support.
While we do not have plans to add this specific feature in our immediate roadmap, insights like yours are instrumental in guiding our development priorities. It would be immensely beneficial if you could share more about your use case involving List/Map attributes in Amazon DynamoDB. Such user information can help reprioritize our backlog of items, ensuring we cater to the evolving needs.
If you have additional questions or if there's any other way we can assist you, I kindly invite you to reply this thread. This allows the Mendix community to benefit from and contribute to this issue.