public class TestRb
{

    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public Address Address { get; set; }
    }

    public class Address
    {
        public string Street { get; set; }
        public string City { get; set; }
    }

    public object Project(Person p)
    {
        return new
        {
            p.Name,
            p.Age,
            p.Address.Street,
            p.Address.City,
        };
        /*
        Instead of specifying maually all the fields, I would like to have
        return new
        {
            p.*,
            p.Address.*,
        };*/
    }

return p;