Is there a way to transfer WhatsApp backup from Google Drive to iCloud?

Same story as many others I guess, I moved from Android to iPhone recently, and didn't do the Move to iOS backup of WhatsApp before setting up the iPhone.

Now I have lost my Android phone and need to activate WhatsApp on the iPhone, but don't want to lose my backups entirely.

Is there a way to:

1. Transfer the WhatsApp backup from Google Drive to iCloud so I can restore it on the iPhone? or... 2. Create a backup of my WhatsApp chats on my computer from what's on Google Drive?

Appreciate any info!