Deleting your apps on your iPhone won't remove any backed up data in your iCloud. If you want to remove the data and app information from your iCloud backup, you'll need to access iCloud settings. Go to SettingsTap on your name to access Apple ID and iCloud settingsGo to iCloudSelect Manage StorageTap on BackupsChoose the iPhone you deleted the app fromFind the app on the list (select Show All Apps if needed)Toggle the app off