Enum defined in a parent abstract model class is not transformed as enum

[AMontagu]

class PreferedContactWay(models.TextChoices):
    PHONE_CALL = "PHONE_CALL", _("PHONE_CALL")
    EMAIL = "EMAIL", _("EMAIL")
    PHONE_MESSAGE = "PHONE_MESSAGE", _("PHONE_MESSAGE")
    WHATS_APP = "WHATS_APP", _("WHATS_APP"

Class PreferedContactWay(models.Model):
    prefered_contact_way: Annotated[models.CharField, PreferedContactWay] = models.CharField(
        max_length=253,
        verbose_name=_("Prefered way to contact"),
        null=True,
        blank=True,
        choices=PreferedContactWay,
    )

    class Meta:
        verbose_name = _("Abstract Contact Info")
        verbose_name_plural = _("Abstract Contact Info")
        abstract = True

Class Contact1(PreferedContactWay):
  ...

This code when generating proto do not transform prefered_contact_way field into an enum.

A way around for now is to redefine the field in the serializer like this:

class Contact1ProtoSerializer(proto_serializers.ModelProtoSerializer):
  prefered_contact_way: Annotated[serializers.ChoiceField, PreferedContactWay] = (
        serializers.ChoiceField(choices=PreferedContactWay)
    )

    class Meta:
        model = Contact1
        fields = [
            "prefered_contact_way",
            ...
        ]