There is no option embedded in WhatsApp to pull backup out of Android and restore the data onto iPhone database.
However, if the Android phone has a new number, once you install WhatsApp on the new phone.
It has the capability to transfer all types of WhatsApp data including chats, messages, media files and attachments between two devices.
This step-by-step guide shows you how to move WhatsApp data between Android and iPhone devices.
WhatsApp allows users to transfer chat history between same type of phones at once.
You can add your Google account back to the phone now.