This post explains how to remove a JSON key in JSON result in MVC or C#

We can create our own converter class:
    public class JsonKeysConverter : JsonConverter 
    { 
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) 
        { 
            Module o = (Module)value; 
            JObject newObject = new JObject(new JProperty(o.Name, o.Permission)); 
            newObject.WriteTo(writer); 
        } 
     
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) 
        { 
            throw new NotImplementedException("The type will skip the converter."); 
        } 
     
        public override bool CanRead 
        { 
            get { return false; } 
        } 
     
        public override bool CanConvert(Type objectType) 
        { 
            return true; 
        } 
    } 
     
    [JsonConverter(typeof(JsonKeysConverter))] 
    public class Module 
    { 
        public string Name { get; set; } 
        public string[] Permission { get; set; } 
    } 
     
    public class Role 
    { 
        public class Roles 
        { 
            public Dictionary<string, List<string>> Modules {get; set;} 
        } 
    } 
     
    public static string json() 
    { 
            var oRoles = new Roles(); 
            oRoles.modules = new Module[] { 
                new Module(){ 
                    Name="Page-Profile", 
                    Permission=new string[]{ "Edit","View","Delete"} 
                }, 
                new Module(){ 
                    Name="User", 
                    Permission=new string[]{ "Edit","View","Delete","Update"} 
                } 
            }; 
            var json = Newtonsoft.Json.JsonConvert.SerializeObject(oRoles); 
         
                     
            Dictionary<string, List<string>> modules = new Dictionary<string, List<string>>(); 
            modules.Add("Page-Profile", new List<string>() { "Edit", "View", "Delete"}); 
            modules.Add("User", new List<string>() { "Edit", "View", "Delete", "Update"}); 
             
            return JsonConvert.SerializeObject(modules);  

Output
{"Page-Profile":["Edit","View","Delete"],"User":["Edit","View","Delete","Update"]}