iCloud User Guide
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Import a contact on iCloud.com
Every contact appears on a virtual card called a vCard. You can import vCards.
Contacts can import vCard format version 3.0 or later.
In Contacts on iCloud.com, click
in the sidebar, then choose Import vCard.
Select a vCard to import.
Contacts from imported vCards are added to the All Contacts group. You can add contacts to any other group by dragging them to the desired group.
If the vCard contains contact information for more than one person, each contact becomes a separate entry.
If your account has Screen Time communication limits turned on, you may not be able to import contacts. See If you can’t create, import, edit, or delete contacts on iCloud.com.
If you can’t import a vCard, it may exceed the iCloud Contacts size limit. See the Apple Support article Limits for iCloud Contacts, Calendars, Reminders, Bookmarks, and Maps.