Django BaseInlineFormset custom attributes to DELETE button

forms.py

class ScheduleInlineFormSet(BaseInlineFormSet):
    def add_fields(self, form, index):
        super().add_fields(form, index)
        # customizing for bootstrap needs
        if "DELETE" in form.fields:
            form.fields["DELETE"] = forms.BooleanField(
                label="Excluir",
                widget=forms.CheckboxInput(attrs={"class": "btn-check"}),
                required=False,
            )