Viber backup and restore

Hi!

I was using android device and just changed to iPhone! I am trying to backup and restore my Viber conversations (messages, photos, videos, etc). The issue is that android devices backup and restore with Google drive and iPhone with iCloud (as everyone knows). How is it possible on 2021 there is no option to choose from any cloud you want to backup and restore? Apple, android and Viber should agree to be such an option!