The use case: The database credentials are stored in Parameter Store for an AWS source Account and we need to share such credentials with other AWS Account.

I know the recommendation is to use System Manager, but that is not a valid option for custom reasons.

We won't access Parameter Store from a Lambda inside another AWS Account/VPC. Instead, we need to access such keys from the AWS CLI to fill in the application environment variables at build time - again, it's not ideal.