PrimaryKeyRelatedField label not inheriting correctly from ManyToMany field's verbose_name

[ntouran]

Imagine you have a ModelSerializer with a field defined like this:

    features = serializers.PrimaryKeyRelatedField(
        many=True,
        queryset=Requirement.objects.all(),
        allow_null=True,
    )

This is related to a model field from a Django model:

    features = models.ManyToManyField(
        Requirement, related_name="events", blank=True, verbose_name="My Features"
    )

When you run an OPTION call on an ModelViewSet configured to return that serializer, you get:

	"actions": {
		"POST": {
			"features": {
				"type": "field",
				"required": true,
				"read_only": false,
				"label": "Features"
			},

		}
	}

but you should get label based on the verbose_name:

	"actions": {
		"POST": {
			"features": {
				"type": "field",
				"required": true,
				"read_only": false,
				"label": "My Features"
			},

		}
	}

If you configure the Serializer field like this, it works as expected:

    features = serializers.PrimaryKeyRelatedField(
        many=True,
        queryset=Requirement.objects.all(),
        allow_null=True,
        label=Event.features.field.verbose_name,
    )

But shouldn't the label be introspected without having to do that manually? I think it's a bug right?