How add to ajax request additional GET params in django-ajax-select?

Question

I need sent parametr region with ajax request in select.

Select sending ajax without additional parameter

`@register('address') class TagsLookup(LookupChannel):

model = Address

def get_query(self, q, request):

    **region = request.GET.get('region')**

    region_null = '__'.join([region, 'isnull'])
    return list(self.model.objects
             .filter(**{region_null: False})
             .exclude(**{f'{region}': ''})
             .exclude(**{f'{region}': ' '})
             .order_by(f'{region}')
             .values_list(f'{region}', flat=True).distinct())

def format_item_display(self, item):
    return u"<span class='tag'>%s</span>" % item.city`

Send region GET parametw with django-ajax-select request. Their documentation says the following:

django-ajax-select documentation