Hi Randy,
After posting another question, a developer of the AWS DynamoDB connector reached out with the following answer:
“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”.
So for now this is not possible yet in the current version, I hope that solves your question, if it does please mark it as accepted, best regards!