[future] Use MaD for handler parameters as sources

MaD simplifies the deployment of custom sources and sinks

Once the Javascript team has added the ability to use selectors with inheritance, we want to take advantage of that feature:

https://github.slack.com/archives/CPB7M1KK9/p1709541801960999?thread_ts=1709308913.747789&cid=CPB7M1KK9