Hi @Anonymous ,
For your first question, do you want to access the .JSON file in a canvas app? The answer is NO. Currently, we could not access the .JSON file in a canvas app directly.
For your second question, there is no official document mentioned about this database which store the .JSON file (configuration info) of a canvas app. The only thing we know is that the .JSON file (configuration info) is stored in Power Apps Server.
If you want to review the JSON schema of the configuration info of your canvas app, you could consider export your canvas app as a package file, then you could find the configuration info for the canvas app there:



You could import the exported package file into other environments, then the exported canvas app would be copied to other Environment.
If the above reply is helpful in your scenario, please consider go ahead to click "Accept as Solution" to identify my reply as helpful.
Best regards,