Delete App From Icloud Storage. This can help free up some space in your icloud storage, while keeping the rest of your conversations up to date across your devices. You will see a list of all of your icloud apps.

Move down and click on icloud. This will stop the automatic backup. If you want to delete app data from an icloud backup, continue with this method.
At the top of the screen, you’ll see what’s taking up space on your icloud account based on categories.
Apple provides 5gb limit to icloud storage for free and people can increase that with a monthly payment. Choose the specific app that you wish you delete and that’s it. Move down and click on icloud. Swipe left and tap on the trash icon to delete the file.