Create a similar template as https://commons.wikimedia.org/wiki/Template:Wikimedia-screenshot which can be applied to screenshots of the app (both for articles and the app UI), Since the app is licensed under MIT and uses icons and libraries from elsewhere which should be attributed somehow as well...
|Open||None||T87268 Copyright license and attribution issues (tracking)|
|Open||None||T149179 Attribution and copyright tasks for the iOS app (tracking)|
|Invalid||None||T138794 Attribute elements shown on promo images for iOS uploaded to Commons|
|Open||None||T148449 Create screenshot-license tag for Commons for the app|