You can export an app’s data as a JSON file in Settings > General > App Management (at the bottom) > Export Application.
Here’s a link to the announcement about this feature: [New Feature] Download app file as JSON
Not sure if it’ll give you all the data you need, but this is the only file about the application that you can officially export (outside of a CSV download of your database records).
You’ll need to be on a paid plan to access this feature.
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