Django FilteredSelectMultiple and OPTGROUPS?

Using Django Forms & APIs
1

Hello!

I have used Django FilteredSelectMultiple widget in my project - very nice widget, havent found anything similar to this for my app - selecting and ordering lab tests.

But i have a question - is it even possible to enable OPTGROUPs for the SELECT in the widget when using ModelForm? Or is it just list plainly all select options without optgroups?

For example - i have 2 models:

class ProbeGroup(models.Model):
    name = models.CharField("Название Группы", max_length=200, blank=True, null=True)
    description = models.CharField("Описание", max_length=200, blank=True, null=True)
    id = models.UUIDField("Идентификатор", default=uuid.uuid4, unique=True, primary_key=True, editable=False)
    order = models.IntegerField("Порядок", default=1)

    def __str__(self):
        return str(self.name)


class Probe(models.Model):
    name = models.CharField("Название теста", max_length=200, blank=True, null=True)
    description = models.CharField("Описание", max_length=200, blank=True, null=True)
    id = models.AutoField("Идентификатор", primary_key=True)
    order = models.IntegerField("Порядок", default=1)
    enabled = models.BooleanField("Включен для клиента", default=True)
    related_to_probegroup = models.ForeignKey(ProbeGroup, on_delete=models.CASCADE, null=True, blank=True,
                                              verbose_name="Привязка к группе")
    probeSpecial = models.CharField("Спец.маркер", max_length=250, blank=True, null=True)

    code = models.CharField("Код", max_length=200, blank=True, null=True)

And want the widget to show both Probes as select option and Probegroups as optgroups, is it possible?

I am using the widget as follow:

class CreateOrderForm(ModelForm):
    class Meta:
        model = Zakaz
        fields = '__all__'

        widgets = {
            'patient': autocomplete.ModelSelect2(url='country-autocomplete', attrs={'data-theme': 'bootstrap4'}),
            'probe': FilteredSelectMultiple(u'Анализы', False,),
        }