I would check to see if the data is saved to iCloud Drive or the On My iPad account. Go to Settings > this app, and look at whether there’s a saved data location you can pick. If there is one, open the Files app to see if there’s a folder either on iCloud Drive or On My iPad.
If there are data files available there, you may be able to share the file to a Mac by using AirDrop or emailing it to yourself. Even if all this is possible, opening a data file in TextEdit may not really give you the data in a form you’ll find useable.