'location for application text file not in home directory

I use linux. I'm working on a project where an app I wrote is launched by my runlauncher. At that time the app looks for an environment variable on the sytem. This environment variable contains a path to a text json file. I want to put this file somewhere on the sytem, not in the home directory. Where would be the appropriate place?

The environment variable is GOOGLE_APPLICATION_CREDENTIALS. The app is a flatpak app.

TLDR: Where do I put things on the system that I can read from my application that are not in the home directory?



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