How do I create a list of values in C# ?

Question

How to create a list of values in C# based on the following data?

I have the following which I need to be converted into list:

Players: [
    {
      Player: {
        PlayerType: Advanced,
        PlayerRole: 12
      }
    }
  ]
}

and I did this

public class Players
        {
            public Players()
            {
                Player = new PlayerMemo();
            }
            [JsonProperty("Player")]
            public Player Player { get; set; }

        }

        public class Player
        {

            public string PlayerRole { get; set; }

            public string PlayerType { get; set; }

        }

I need to convert this into one line list and add it to the previously declared
localvariable.list = here-goes-my-one-line-list: (something like this)

loadgroup.Players = new Players()
            {
                { new Players() {"PlayerRole", "Member"} },

            };