Recording Variables to be available project-wide on all pages

I’d like to set up a variable during login, that will be available to all files afterward.
As an example, I’d like after the Security Login has been validated, to keep the Firstname and Role of the visitor. How is best to do this?
I tried setting up Global $_Session variables and filling them after the login (and Saved the Server Action of course), but they don’t show in the data picker after that.
Maybe Global $_Sessions are only available for subsequent API calls, and there is another way to do this to have FirstName and Role available to page content?
Thank you

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