How to use configuration/conversion extensions

I am trying to find the example on how to exactly use the configuration/conversion extension. Trying to create simple example where I can see the format of how to pass http request in what format and how it will return the response and set as configuration file but its not working. Can someone has any reference on this topic?
My aim is to split drone.yml file but for this I need to understand how this extension works so that I can implement it in my project