If I get the time I will publish and link it for you.

The way it works is by leveraging the existing aws client libraries to sign and (de)serialise parameters and responses, so you can do something like:

hx-ext="aws" hx-post="aws:ec2:us-east-1" aws-action="DescribeInstances"

and it will just work with any params such as form inputs or hx-vals etc

the reason i haven't posted it yet is i want to find a good way of mapping parameters since the aws api can have some notoriously complicated parameter formats