Do I have to create "the global lookup table" for globalization? #500

Hi, I read these documents.There are two approaches for globalization of Azure AD B2C.
https://learn.microsoft.com/en-us/azure/active-directory-b2c/azure-ad-b2c-global-identity-funnel-based-design
https://learn.microsoft.com/en-us/azure/active-directory-b2c/azure-ad-b2c-global-identity-region-based-design

If my understanding is right, either way, you will need "the global lookup table" that you have to create for Azure AD B2C by yourself.
image
The problem is, if you create the table and the API for it, you still have to take care of data residency laws , e. g. GDPR.
As far as my understanding, the replication of PII is included in the transfer of GDPR. So, what should I do? Should I need to HASH email address like link below?
https://github.com/azure-ad-b2c/samples/tree/master/policies/remote-profile#user-flow-with-email-in-hash-format
If possible, I want to set up only Azure AD B2C without creating the table.