Integrating AAD B2C in an existing Blazor Server App

[DaleCam]

Hi there!
Im having trouble getting AAD B2C Integrated into an existing Blazor Server application.
The documentation here only specifies scaffolding into a new Web Assembly app:
https://docs.microsoft.com/en-us/aspnet/core/blazor/security/webassembly/hosted-with-azure-active-directory-b2c?view=aspnetcore-5.0

Can anyone please point me to any documentation that will help me add it to an existing Blazor Server app?
Thanks in advance!