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You’re not allowed to store PII in Google Analytics already as per the terms of service:

You will not and will not assist or permit any third party to, pass information to Google that Google could use or recognise as personally identifiable information.

https://www.google.com/analytics/terms/us.html , section 7.

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Even if you don't send personal data to Google analytics they store personal data automatically. At least Google Analytics for Firebase store the following identifiers: Mobile ad IDs IDFVs/Android IDs Instance IDs Analytics App Instance https://firebase.google.com/support/privacy/

But those can change and if you don't store personal information you can't relate to an specific individual.

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