Serialize dynamic response to key value pair C#

Question

I am trying to retrieve a response from an internal API and one of the objects in the response has dynamic fields. Something like this.

{
   "className": "grade12",
   "School": "peg school",
   "attributes": {
      "propA": ["a1","a2","a3"],
      "propB": ["b1","b2","b3",
      "propC": ["c1","c2","c3"],
      .
      .
      .
      "propZ": ["1","2","3"]
   },
   "Create": "2022-01-31"
}

In the attributes field, there can be any number of fields . It can be empty or have 30 values. I would like to serialize something like

public class Fields
    {
        public string Name { get; set; }
        public List<string> Value { get; set; }
     
    }

    public class Parent
    {
        public string className { get; set; }
        public string School { get; set; }
        public List<Fields> AllFields { get; set; }
        public string Create { get; set; }
    }

So that when I serialize I will have

{
   "class": "grade12",
   "School": "peg school",
   "AllFields": [
      {
         "Name": "propA",
         "value": ["a1","a2","a3"]
      },
      {
         "Name": "propA",
         "value": ["a1","a2","a3"]
      }
   ],
   "Create": "2022-01-31"
}

So how can I achieve this?