Can I access User Secrets from a _Framework_ Web API project?

I'm targeting .NET Framework 4.8, mainly because I sometimes have to interact with Access databases and I assume I have a better chance of that working for framework than .NET Core.

When deployed, I want this API to pick up any credentials it needs from environment variables but I would like to be able to test it locally, so I'm trying to find the best place to store the credentials without checking them in.

I have read this and similar articles - user secrets seems like a reasonable solution, maybe there are better ones.

https://learn.microsoft.com/en-us/aspnet/core/security/app-secrets?view=aspnetcore-8.0&tabs=windows&source=docs 

The part about "Manage User Secrets" in Visual Studio seemed to work at least partially: it installed Microsoft.Configuration.ConfigurationBuilders.UserSecrets and added this to my Web.config:

  <configSections>
    <section name="configBuilders" type="System.Configuration.ConfigurationBuildersSection, System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" restartOnExternalChanges="false" requirePermission="false" />
  </configSections>
  <configBuilders>
    <builders>
      <add name="Secrets" userSecretsId="583724f7-d984-4688-84cd-cb8b28df5527" type="Microsoft.Configuration.ConfigurationBuilders.UserSecretsConfigBuilder, Microsoft.Configuration.ConfigurationBuilders.UserSecrets, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
    </builders>
  </configBuilders>

It loaded up a secrets.xml file and I can find examples of adding secrets to that.

Where I'm stuck is how to access them from the code. I see .NET Core examples where they call AddUserSecrets<Program>() on their ConfigurationBuilder in their Config.cs but again mine is a framework app and I just have a WebApiConfig.cs with a Register(HttpConfiguration config).

In there it accesses GlobalConfiguration.

I just don't have the past experience to figure out what the analogous thing would be for framework.

Thanks,

-Jeff