Enviroment variables in config.production.json

Hello, I would like to ask for the help about usage of environment variables in config.production.json. I could not find any guidelines therefore I’m trying to get help here. I’m hosting my ghost blog on Heroku, the environment variables are defined there and the build is successful however it won’t work as the JSON is just a text file when I define my variables as ‘string’. For example: “url”: “process.env.URL”,

Docs are here:

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