ASP.NET Core Get Json Array using IConfiguration

In appsettings.json

{
      "MyArray": [
          "str1",
          "str2",
          "str3"
      ]
}

In Startup.cs

public void ConfigureServices(IServiceCollection services)
{
     services.AddSingleton<IConfiguration>(Configuration);
}

In HomeController

public class HomeController : Controller
{
    private readonly IConfiguration _config;
    public HomeController(IConfiguration config)
    {
        this._config = config;
    }

    public IActionResult Index()
    {
        return Json(_config.GetSection("MyArray"));
    }
}

There are my codes above, I got null
How to get the array?