abp proxy-generator -t ng doesn't work with inheritance

I downloaded the github example from the ABP bookstore described in here: https://abp.io/docs/latest/tutorials/book-store/part-09?UI=NG&DB=Mongo

I modified it to add new services for exams, each exam has different types of questions Dtos that inherits from the base class QuestionDto as bellow:

public class QuestionDto : AuditedEntityDto<Guid>
{
public string Name { get; set; }
public QuestionType Type { get; set; }
public string Title { get; set; }
public string MarksText { get; set; }
public int MarkValue { get; set; }
}

public class MultipleChoiceQuestionDto : QuestionDto
{
public string Subtitle { get; set; }

[JsonConverter(typeof(ChoicesDtoConverter))]
public List<(char Option, string Text)> Choices { get; set; }

public char CorrectChoice { get; set; }
public bool IsAnExampleQuestion { get; set; }
}


There is the service method GetListAsync that I am executing as bellow:

[Authorize(BookStorePermissions.Books.Default)]
public class ExamAppService : CrudAppService<
Exam, // The Exam entity
ExamDto, // Used to show exams
Guid, // Primary key of the exam entity
PagedAndSortedResultRequestDto, // Used for paging/sorting
CreateExamDto, // Used to create an exam
UpdateExamDto>, // Used to update an exam
IExamAppService // Implement the IExamAppService
{
private readonly IRepository<Exam, Guid> _examRepository;

public ExamAppService(IRepository<Exam, Guid> repository)
: base(repository)
{
}

public async override Task<PagedResultDto<ExamDto>> GetListAsync(PagedAndSortedResultRequestDto input)
{...


The problem is that even it returns the right value in swagger when executing this method, the models generated by the command abp proxy-generator -t ng in angular is missing the subtypes of QuestionDto. Do you know how can I explicitly say that those subtype of classes exist so it will take it into consideration?

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