Notification data will be stored on FCM servers so I would assume Google will be able to see notification data. Regarding content I guess it depends on the data within the notification?

https://firebase.google.com/docs/cloud-messaging/concept-options#encryption_for_data_

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Google is already pulling everything they can from relays. But yes, the event goes through Firebase servers.

Thank you for giving us users of both options (F-Droid & Google Play) 🤙⚡ hugely appreciated I wish this was an option for all apps

Right but notifications potentially include decrypted information like DM content or private zap content. Can you see this information? Can Google?