System.Text.Json.Serialization. Serialize string property as raw value

Question

Is it possible to serialize string property value as "raw" text, not as string with double quoutes (that naturally happens).

public class Demo
    {
        public int IntValue { get; set; }
        public string StrValue { get; set; }
        public string RawValue { get; set; }
    }

 Demo obj = new Demo { IntValue = 1, StrValue = "abc", RawValue = "{\"intProp\": 123 }" };
 string result = System.Text.Json.JsonSerializer.Serialize(obj);
 Console.WriteLine(result);

Output:

{
   "IntValue":1,
   "StrValue":"abc",
   "RawValue":"{intProp: 123 }"
}

Expected output:

{
   "IntValue":1,
   "StrValue":"abc",
   "RawValue": {intProp: 123 }
}

Thank you in advance!