Asp .Net Core Json deserialize to model

It all depends on you,what type of value you want to receive?string or List?

I tried with the codes:

public class SomeModel
    {
        public SomeModel()
        {
            fuelType = new List<string>();            
        }
        public int Id { get; set; }
        public string  Name { get; set; }
        
        public List<string> fuelType { get; set; }

        //you could move the codes to someservice
        public List<string> someresult(string a)
        {
            var targetlist = new List<string>();
            targetlist.Add(a);
            return targetlist;
        }
        public List<string> someresult(List<string> a)
        {
            var targetlist = new List<string>();
            targetlist.AddRange(a);
            return targetlist;
        }
    }

[HttpPost]
        public JsonResult SomeAction()
        {
            var somemodel = new SomeModel() { Id = 1, Name = "name" };
            var somevalue = /*"a"*/new List<string>() { "a", "b", "c" };
            var targetvalue = somemodel.someresult(somevalue);
            somemodel.fuelType.AddRange(targetvalue);
            return new JsonResult(somemodel);
        }

Result:

try this

var fuelType = JsonConvert.DeserializeObject<MyClass>(json);

public class MyClass
{
    [JsonProperty("fuelType")]
    private JToken _fuelType;

    [JsonIgnore]
    public string[] fuelType
    {
        get {
if (_fuelType==null) return null;
 return _fuelType is JArray ? _fuelType.ToObject<string[]>() : new string[] { (string)_fuelType }; }
        set { _fuelType = JsonConvert.SerializeObject(value); }
    }
}