How to display chart from higcharts.com in Unity? - using C#

Question

I am Unity beginner, so sorry in advance if my problem is easy to fix, I spent five days on it and still don't have the solution. I am trying to display chart generated by highcharts.com like this one: Clink to see the chart. I am working with Unity and Vuforia. This is my code so far:

json1.json (I took it from the highcharts website)

{

        "chart": { "type": "line" },
        "title": { "text": "My Chart" },
        "subtitle": { "text": "My Untitled Chart" },
        "exporting": {},
        "series": [
            {
                "turboThreshold": 0,
                "_symbolIndex": 0,
                "name": "Level of decibels",
                "marker": {},
                "_colorIndex": 0
            }
        ],
        "plotOptions": {
            "series": {
                "dataLabels": {},
                "animation": false
            }
        },
        "tooltip": {},
        "legend": {},
        "lang": {},
        "credits": {},
        "yAxis": { "title": {} },
        "data": {
            "csvURL": "here is my url to csv",
            "enablePolling": true,
            "dataRefreshRate": "2"
        },
        "googleSpreadsheetKey": false,
        "googleSpreadsheetWorksheet": false
    }

converterJson.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using System;

public class ConverterJson : MonoBehaviour {

    string path;
    string jsonString;

    void Start()
    {
        path = Application.streamingAssetsPath + "/json1.json";
        jsonString = File.ReadAllText(path);

        RootObject myObject = JsonUtility.FromJson<RootObject>(jsonString);

    }

}

[Serializable]
public class Chart
{
    public string type { get; set; }
}

[Serializable]
public class Title
{
    public string text { get; set; }
}

[Serializable]
public class Subtitle
{
    public string text { get; set; }
}

[Serializable]
public class Exporting
{
}

[Serializable]
public class Marker
{
}

[Serializable]
public class Series
{
    public int turboThreshold { get; set; }
    public int _symbolIndex { get; set; }
    public string name { get; set; }
    public Marker marker { get; set; }
    public int _colorIndex { get; set; }
}

[Serializable]
public class DataLabels
{
}

[Serializable]
public class Series2
{
    public DataLabels dataLabels { get; set; }
    public bool animation { get; set; }
}

[Serializable]
public class PlotOptions
{
    public Series2 series { get; set; }
}

[Serializable]
public class Tooltip
{
}

[Serializable]
public class Legend
{
}

[Serializable]
public class Lang
{
}

[Serializable]
public class Credits
{
}

[Serializable]
public class Title2
{
}

[Serializable]
public class YAxis
{
    public Title2 title { get; set; }
}

[Serializable]
public class Data
{
    public string csvURL { get; set; }
    public bool enablePolling { get; set; }
    public string dataRefreshRate { get; set; }
}

[Serializable]
public class RootObject
{
    public Chart chart { get; set; }
    public Title title { get; set; }
    public Subtitle subtitle { get; set; }
    public Exporting exporting { get; set; }
    public List<Series> series { get; set; }
    public PlotOptions plotOptions { get; set; }
    public Tooltip tooltip { get; set; }
    public Legend legend { get; set; }
    public Lang lang { get; set; }
    public Credits credits { get; set; }
    public YAxis yAxis { get; set; }
    public Data data { get; set; }
    public bool googleSpreadsheetKey { get; set; }
    public bool googleSpreadsheetWorksheet { get; set; }
}

To get Serializable classes I converted json1.json file using json2scharp website. To display the chart I dragged ConverterJson script to the plane 3D object. Everytime when I run the program, the plane is blank. I don't have any errors, just one warning:

warning CS0219: The variable `myObject' is assigned but its value is never used

I know that I missed something in my code, but I am not sure how to fix it. Thank you for your answers in advance!