using System;

using System.Collections.Generic;

using System.Text.Json;

using System.Text.Json.Serialization;

public class Program

{

    public static void Main()

    {

        var asString = Values.Foo;

        var instance = new TestClass { Value = Values.Bar };

        var options = new JsonSerializerOptions { Converters = { new JsonStringEnumConverter() } };

        var asJson = JsonSerializer.Serialize(instance, options);       

        Console.WriteLine(asJson);

        var objectAgain = JsonSerializer.Deserialize<TestClass>(asJson, options);

        Console.WriteLine(objectAgain.Value == Values.Bar);

    }

    public enum Values

    {

        Foo,

        Bar

    }

    public class TestClass

    {

        public Values Value { get; set; }   

    }

}