Gmail has a "Notes" label for storing notes as emails. MacOS and iOS have an Apple Notes application that can be used as a native client for editing Gmail notes.
How can I edit Gmail notes on Windows or Linux?
Google Keep seems to provide a web and mobile experience for editing Google Keep notes (a web client and native clients for iOS and Android), but I want to use the macOS and iOS Apple Notes application on Apple devices. And as far as I know, Apple Notes cannot be used as a native client for editing Google Keep notes.