How do I open json file from resx file?

I have resources.resx file and I have resources folder. I'm trying to get one json file from it.

project structure:

code I have

string resxFile = @".\resources.resx";
using (ResXResourceSet resxSet = new ResXResourceSet(resxFile)) {
                
                using (JsonDocument document = JsonDocument.Parse((FileStream)resxSet.GetObject("allCivs"))) {
                    ...
                }
            }

I get this error:

As far as I understand, I am not correctly specifying the path to the "resx" file, because the program tries to find this file in the "bin" folder.

How can I correctly specify the path to it? Are my further actions for reading the json file correct?

EDIT:

data inside allCivs.json(just two elements,there are 43 like those):

"Austria": {
        "Лидер": [
            {
                "image": "civStuffIcons/Австрия_Лидер1.png",
                "Мария Терезия": {
                    "Персоналия": "Дипломатическая уния:Позволяет тратить  золото на то, чтобы присоединять или делать сателлитами города-государства, которые оставались вашими союзниками 5 и более ходов."
                }
            }
        ],
        "Уникальный юнит": [
            {
                "image": "civStuffIcons/Австрия_Уникальный юнит1.png",
                "Гусар": {
                    "Эпоха": "Новейшее время",
                    "Замещает": "Кавалерист",
                    "Сила": "34"
                }
            }
        ],
        "Уникальное здание": [
            {
                "image": "civStuffIcons/Австрия_Уникальное здание1.png",
                "Кофейня": {
                    "Замещает": "Мельница",
                    "Эффект": "+5% ед. продукции +2 ед. продукции Увеличивает на 25% ОВЛ скорость возникновения великих людей в городе.Может быть построена в любом городе."
                }
            }
        ],
        "Флаг": "civsFlags/austria.png"
    },
{
    "America":{
       ...
    }
}

data inside Resources:

I need to loop through this file and, for example, get all country names(in this example it's "Austria","America")

Fist, get file "allCivs" ,then you must parse json "allCivs" and Find Countries

Final Code

string resxFile = @".\resources.resx";
List<string> _listCountry = new List<string>();
using (ResXResourceSet resxSet = new ResXResourceSet(resxFile))
{

 byte[] allCivs =(byte[]) resxSet.GetObject("allCivs");
 var texts = System.Text.Encoding.UTF8.GetString(allCivs, 0, allCivs.Length);

var jsonObject = JObject.Parse(texts);
               
 foreach (var x in jsonObject)
 {
   _listCountry.Add(x.Key);
 }

}

Additional information

1.Way Solve Fist Problem ,you must change "Copy to output directory" properties on file resources.resx

> 1.Right click resources.resx -> properties.
>
> 2.Change 'Copy to output directory' to "Copy Always" or "Copy if Newer "

2.Read a key, you can use below code

  var Value = resxSet.GetString("allCivs");

 //using (JsonDocument document = JsonDocument.Parse((string)resxSet.GetObject("Test")))
 //{
//    var d = "";
  //}

3.Read all of keys, you can use below code

foreach (DictionaryEntry entry in resxSet)
{
   string resourceKey = entry.Key.ToString();
   object resource = entry.Value;
}

4.You can get List Country in json file with use below code

using Newtonsoft.Json.Linq;

string text = File.ReadAllText(@"Test.json");
            var jsonObject = JObject.Parse(text);

            List<string> _list = new List<string>();
            foreach (var x in jsonObject)
            {
                _list.Add(x.Key);
            }