A free and open-source web framework that enables developers to create web apps using C# and HTML, developed by Microsoft.
It would be through App Configuration. More Information: ASP.NET Core Blazor configuration
If you need to maintain configuration data per user-level, then maybe you will need to store those in some kind of a database and retrieve from there. (For subsequent calls, you can cache the results, and pick up from cache instead of calling the database all the time).