Convert Type to Json C#

there is some way to convert a Type to Json. My problem is this:

I have this interface:

       public interface IParametersRequestVO{

       }

And then i have some objects that implements this interface and i want to get all class that implement this interface and generate a schema json using the type without create the concrete object. This is one of my objects:

       public class LoginRequestVO : IParametersRequestVO{
                     public string Login{ get; set; }
                     public string Password{ get; set; }
       }

When i use the term schema Json i mean this:

     var LoginRequestVO  = { 
                       Login: "",
                       Password: ""
     }

There is some way to do that ?