BSON Serialization in C # Driver for MongoDB

I just started playing with MongoDB and the official C # driver. And I have a little question about object serialization. For example, we have classes:

public class User
{
    public string Name;

    public List<Comment> Comments = new List<Comment>(){ new Comment() };
    public List<Card> Cards = new List<Card>() { new Card() };
}

public class Comment
{
    public string Id;
    public string Text;
}

public class Card
{
    public string Id;
    public string Text;
}

      

        
        
        
      

    

I want to get a serialized collection of maps in User, but a collection of comments like DBRef. Is it possible to achieve this with the latest C # standard driver? It would be great to use some attribute, for example:

public class User
{
    public string Name;

    [UseDBRef]
    public List<Comment> Comments = new List<Comment>(){ new Comment() };

    public List<Card> Cards = new List<Card>() { new Card() };
}