custom form fields(parameters) on NetboxModelImportView

[nix6]

Hi. I am trying to add a custom parameter to Netbox bulk import form, similar to existing parameters like Format, csv_delimiter, upload_file.

Scenario:

There is a model DemoModel with three CharFields: batch_name, field1, field2.

I want to be able to import a CSV file with only field1 and field2 and add to each row a value from the form input field for batch_name.

I tried the following:

class DemoImportForm(NetBoxModelImportForm):
    batch_name = forms.CharField(
        required=True,
        label='Batch name'
    )
    class Meta:
        model = DemoModel
        fields = ('field1', 'field2')

Then in views.py:

class DemoBulkImportView(generic.BulkImportView):
    queryset = models.DemoModel.objects.all()
    model_form = forms.DemoImportForm
    template_name = 'custom_import.html'

In custom_import.html I added rendering of form.batch_name, but I get an error. After reviewing in Django Debug Toolbar, I see that the field batch_name is sent to the template in the context variable "fields", not "form". And it is showing in the "Field options" list at the bottom of the form.

Is there a way to customize the import form with an additional parameter? If not, what would be an alternative approach?

Thanks