using Newtonsoft.Json.Linq;
using System.Collections.Generic;
public static void Main()
JObject projectOuter = new JObject(new JProperty("project", new JObject()));
JObject projectInner = new JObject(new JProperty("project", new JObject()));
projectInner["project"].Value<JObject>().Add(new JProperty("currentProjectPhaseId", 123));
projectOuter["project"] = projectInner;
Console.WriteLine((projectOuter));