Hi ShurGopal,
For help with third party apps and what is backed up using iCloud you may need to reach out to the developer directly. Before you do you can check your iCloud storage with the steps below found in the article here: Manage your iCloud storage
"Choose which apps to back up on your iPhone, iPad, or iPod touch
- Go to Settings > [your name] > iCloud.
- Tap Manage Account Storage or tap Manage Storage, then tap Backups.
- Tap the name of the device that you're using.
- Turn off any apps that you don't want to back up.
- Choose Turn Off & Delete.
When you confirm that you want to Turn Off & Delete an app, it turns off iCloud Backup for that app and removes all of its information from iCloud."
If the app is listed certain content may be backed up using iCloud. Feel free to also check out more information in the section "What kinds of data do third-party apps store in iCloud?" in the article here: Keep third-party app data up to date on all your Apple devices with iCloud
For exact details on what is backed up when using iCloud with the app, you can also reach out to the app developer to assist. If needed, find steps on how to connect here: How to contact an app developer - Apple Support
Best.