Whatsapp chat transfer from Android to Ios

Hello,

I am trying to transfer my whatsapp chat from android to Ios through backup. When I take backup of chat on android, it gives me only one option to save the chat on google drive.

When I uninstall whatsapp from android and install it on Ios, according to my research I should get a notification on my iphone saying that I have a backup. Instead I get a notification saying that no backup found on cloud.

Can someone please help.

Thanks.