How to change the default folder of an ASP .NET Core application?

I'm trying to set up an ASP .NET Core Web site to host an AngularJS application.

The structure that my "index" page is using is:

/wwwroot/app/index.html

I tried some settings in the Startup.cs file, like this:

    app.UseStaticFiles(new StaticFileOptions()
            {
                FileProvider = new PhysicalFileProvider(
                    Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "app"))
            });

And also tried the following configuration in the Main method:

    var host = new WebHostBuilder()
        .UseKestrel()
        .UseContentRoot(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "app"))
        .UseIISIntegration()
        .UseStartup<Startup>()
        .Build();

Even with both settings above, I still need to navigate the URL link to render the Index.html file.

I want the Index.html file to be rendered when I navigate to the root URL link

EDIT:

I just found the solution. You need to add this to the WebHostBuilder call:

    .UseWebRoot(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "app"))