Passing secure string from library

Hi,

I'm using "AWS CloudFormation Create/Update Stack" task to deploy and RDS instance.
How do I pass a secure string from my library?
My cloudformation template is written in YAML

Thanks,

The issue names the AWS CloudFormation Create/Update Stack task and a YAML template, but no repository file or test. Start by locating that task and its library-related inputs, then establish whether secure-string values are supported; done would require a clear supported path or documented limitation.

Written by the indexing model from the issue text.