WhatsApp has a cloud backup, but Google Drive is used for Android and iCloud for iOS. Moving across is impossible. WhatsApp uses other points to simplify the change of operating system. WhatsApp announced some time ago that it would simplify the move between the two popular smartphone operating systems, Android and iOS.
The first promises have been implemented, but are currently still very limited. Another feature for a well-known migration app is in the works to make it very easy for users to migrate from Android to iOS.
Apple and WhatsApp want to enable the move via Move to iOS. This is an official app that has been facilitating the move from Android to iOS for a while. The latest discoveries by WABetainfo reveal that it may soon be possible to transfer WhatsApp content from Android to iOS more easily using this app.