Hi all! There is a button to add an Elasticache cluster in front of a RDS cluster in the AWS console (see: https://aws.amazon.com/about-aws/whats-new/2023/04/amazon-elasticache-cache-rds-databases-console/ ), but I don't see anything related to that in pulumi documentation, it's not supported ?

I can't speak for Pulumi, but there are a lot of examples of things that the Console has that the API doesn't like this. Another example is the VPC creation wizard that creates subnets/routes/natgws/etc

IIRC this is literally just creating a cache for you with similar settings to your DB. There isn't special sauce here.