code: public ItemRequest<CustomField> createEnumOption(String customField) {
      
          String path = String.format("/custom_fields/%s/enum_options", customField);
          return new ItemRequest<CustomField>(this, CustomField.class, path, "POST");
      }
docs: Creates an enum option and adds it to this custom field's list of enum options. A custom field can have at most 50 enum options (including disabled options). By default new enum options are inserted at the end of a custom field's list.
  
  Returns the full record of the newly created enum option.
  
  @param  customField Globally unique identifier for the custom field.
  @return Request object