@Guilherme Pereira
I have to say this component is not completed yet, especially for the function - DeleteItem.
in the AWS DynamoDB official Document, delete can perform delete multiple items with ConditionExpression.
but in this extension, we only can perform a fuzzy delete action by delete certain Partition Key or Sort Key, which must following attached screenshot format.

Maybe we can change it into like below function?
https://docs.microsoft.com/en-us/dotnet/api/orleansawsutils.storage.dynamodbstorage.deleteentryasync?view=orleans-1.0