On macOS, you can import Gmail contacts to iCloud by first signing in to your Gmail account and accessing Google Contacts through a browser. From there, download your contacts in vCard (.vcf) format. Once the file is saved, log in to iCloud.com, open Contacts, and upload the file. After the import, your Gmail contacts will sync automatically with iCloud and appear on your Mac, iPhone, and iPad.

For users who manage contacts from multiple Gmail accounts or prefer fewer manual steps, the MailConverterTools Gmail Backup Tool (Mac version) offers a guided way to import Gmail contacts to iCloud while keeping contact details accurate and organized.
Read more: https://www.mailconvertertools.com/blog/import-gmail-contacts-to-icloud/