model.cs

public class FormSection {
  public string Name { get; set; }
  public List<SmartFormField> FormFields { get; set; }
}

public class SmartFormField {
  public string Name { get; set; }
  public string Text { get; set; }
}

public class SmartTextFormField : SmartFormField {
  public string TypeName { get; set; } = "SmartTextFormField";
}

public class SmartCheckboxField : SmartFormField {
  public bool Checked { get; set; }
  public string TypeName { get; set; } = "SmartCheckboxField";
}

public class SmartDropdownField : SmartFormField {
  public string[] Items { get; set; }
  public string TypeName { get; set; } = "SmartDropdownField";
}

public class SmartDateField : SmartFormField {
  public string Date { get; set; }
  public string TypeName { get; set; } = "SmartDateField";
}