Change NSwagStudio serialization setting to allow for Nulls

Question

Is there a way to change the settings in NSwagStudio so that when the JSON serialization setting outputs as Newtonsoft.Json.Required.AllowNull instead of Newtonsoft.Json.Required.Always?

I currently have the property manually changed to allow for nulls.

[Newtonsoft.Json.JsonProperty("returnCode", Required = Newtonsoft.Json.Required.Always)]
public int ReturnCode { get; set; }

And I need it to be:

[Newtonsoft.Json.JsonProperty("returnCode", Required = Newtonsoft.Json.Required.AllowNull)]
public int ReturnCode { get; set; }

Answer 1

It will not be nullable inside the generated code if it is not nullable at the API-spec

API spec example:

    ReturnCode:
      type: integer
      nullable: true