repo.cs

public class TestEnumerator2
    {
        public string Name { get; set; }

        public bool IsSucceed { get; set; }

        public ObservableCollection<int> Toto { get; set; }

        public TestEnumerator2()
        {
            Toto = new ObservableCollection<int>();
        }
    }
var serialize = JsonSerializer.Serialize(new TestEnumerator2(),new JsonSerializerOptions { ReferenceHandler = System.Text.Json.Serialization.ReferenceHandler.Preserve});
var deserialize = JsonSerializer.Deserialize<TestEnumerator>(serialize);