How to get AWS-managed key for encrpyting RDS database instance

Question

How is CDK supposed to grab an AWS-managed key for an RDS database instance's StorageEncryptionKey property? I tried  
  
var encryptionKey = Key.FromLookup(this, "aws/rds", new KeyLookupOptions { AliasName = "aws/rds" });  
var encryptionKey = Key.FromKeyArn(this, "aws/rds", _wellKnownKmsKeyArn);  
  
but both return null.

Accepted Answer

Ok my mistake; the _wellKnownKmsKeyArn variable is actually accessed via a multi-layered JSON object and the class definition wasn't setup properly.  
  
Using Key.FromKeyArn() is the method to use after properly getting the aws/rds key ARN.

How to get AWS-managed key for encrpyting RDS database instance

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