Have a v4 Azure function Im starting. I want to create a service class and inject it at startup so I can use it via my function. Im reading my configuration values into objects using the Options pattern, as seen in the docs. How can I get this options object injected into the service class constructor?

  In program.cs
  ================
  
  var host = new HostBuilder() 
    .ConfigureFunctionsWebApplication()
    .ConfigureServices(services =>
    {
        services.AddOptions<Section1Options>()
            .Configure<IConfiguration>((settings, configuration) =>
            {
                configuration.GetSection().Bind(settings);
            }
            
        services.AddSingleton<ICustomService, CustomService>();
    }
    
    
  
  CustomService.cs
  ===============
  
  public class CustomService : ICustomService
  {
    private readonly Section1Options _customConfig;
  
    public CustomService(IOptions<Section1Options> customConfig) 
    {
        _customConfig = customConfig;
    }
  
    public string TestIt() {
    
        return "hello";
    }
  
  }
  
  Azure Function, constructor
  ==============
  
  private readonly ICustomService _customService;
  public MyFunction(ILogger<MyFunctionclass> logger, ICustomService customService)
  {
    _customConfig = customService;
  }