Completing the given example would be really useful.

It would great to follow through on the example of adding date of birth to the retrieved claims using the additional scope: https://www.googleapis.com/auth/user.birthday.read. I can't see how I can retrieve this without adding the Google API client to my project and accessing the Person API directly. This seems excessive given the Microsoft.AspNetCore.Authentication.Google client has already authenticated - there doesn't seem to be a route to leverage that authentication for additional requests either.

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#### Document Details

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* ID: 64faf33b-2511-5e8f-c1b0-94f32dc07fa4
* Version Independent ID: 2697abc8-7727-2eba-74a5-fbbc8a7c80ff
* Content: [Persist additional claims and tokens from external providers in ASP.NET Core](https://learn.microsoft.com/en-us/aspnet/core/security/authentication/social/additional-claims?view=aspnetcore-6.0)
* Content Source: [aspnetcore/security/authentication/social/additional-claims.md](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/social/additional-claims.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-security**
* GitHub Login: @Rick-Anderson
* Microsoft Alias: **riande**