dbx databricks deploy named properties

Question

Can anyone provide me a link to an example of using named properties in dbx. The documentation mentions an example of a .json file,

https://dbx.readthedocs.io/en/latest/named_properties.html

but it does not mention how we can invoke this file with sample variables. Do I need to write python code to have a file containing these variables?

I have two enviornments and I want to pass on different variables to the deployment.json file.