Loading JSON into JSON issue,JSON file inside JSON problem

Hey, i'm currently struggling with JSON parsing.

My json file has been generated with Construct 2, it contains json files (maps) inside this one json (map pack)

Here's an example of a map pack (contains only one map)

 {"c2array":true,"size":[1,1,1],"data":[[["{\"c2array\":true,\"size\":[22,9,1],\"data\":[[[\"wall\"],[0],[0],[10],[480],[0],[0],[0],[0]],[[\"wall\"],[0],[470],[860],[10],[0],[0],[0],[0]],[[\"wall\"],[850],[0],[10],[470],[0],[0],[0],[0]],[[\"wall\"],[10],[0],[840],[10],[0],[0],[0],[0]],[[\"wall\"],[160],[190],[110],[140],[0],[0],[0],[0]],[[\"wall\"],[340],[280],[140],[130],[0],[0],[0],[0]],[[\"wall\"],[520],[120],[190],[150],[0],[0],[0],[0]],[[\"plateform\"],[415],[140],[0],[0],[0],[0],[0],[0]],[[\"plateform\"],[195],[160],[0],[0],[0],[1],[5],[5]],[[\"launcher\"],[415],[280],[0],[0],[0],[0],[5],[1]],[[\"ray\"],[15],[90],[0],[0],[0],[0],[5],[1]],[[\"spawn\"],[365],[265],[0],[0],[0],[0],[0],[0]],[[\"mine\"],[465],[280],[0],[0],[0],[0],[5],[0]],[[\"plateformspike\"],[65],[350],[0],[0],[0],[0],[0],[0]],[[\"plateformspike\"],[185],[390],[0],[0],[0],[1],[10],[2]],[[\"spike\"],[520],[185],[0],[0],[270],[0],[0],[0]],[[\"spike\"],[545],[270],[0],[0],[180],[0],[0],[0]],[[\"spike\"],[635],[270],[0],[0],[180],[0],[0],[0]],[[\"spike\"],[710],[175],[0],[0],[90],[0],[0],[0]],[[\"spike\"],[645],[120],[0],[0],[0],[0],[0],[0]],[[\"spike\"],[615],[470],[0],[0],[0],[0],[0],[0]],[[\"flag\"],[225],[190],[0],[0],[0],[0],[0],[0]]]}"]]]}

Now to load this json file i'm using the follow C# script: using System.Collections; using System.Collections.Generic; using UnityEngine; using System.IO; using System;

 public class mapLoad : MonoBehaviour {
     public string jsonString;
     public C2Map valeur;
 
 
     public bool c2array;
     public List<int> size;
     public List<List<List<string>>> data;
 
     /*
     JSON Parsing:
 
         X,0 = Type d'objet
         X,1 et X,2 = Position X/Y
         X,3 et X,4 = Width / Height
 
 
 
 
     */
 
     // Use this for initialization
     void Start () {
         jsonString = File.ReadAllText(Application.dataPath + "/Maps/MapFiles/Test/document.json");
         C2Map valeur = C2Map.CreateFromJSON(jsonString);
         c2array = valeur.c2array;
         size = valeur.size;
         data = valeur.data;
 
 
     }
 
 
 
     // Update is called once per frame
     void Update () {
         
     }
 }
 [System.Serializable]
 public class C2Map
 {
 
     public bool c2array;
     public List<int> size;
     public List<List<List<string>>> data;
 
     public static C2Map CreateFromJSON(string jsonString)
     {
         return JsonUtility.FromJson<C2Map>(jsonString);
 
     }
 }

Everything before the "data" field works but once it goes to data, the public variable gets destroyed, i've tried different methods but it either return null or destroy the variable, no errors, nothing