I have the Argento theme installed on my Magento 2.2 store; the ProLabels extension comes with Argento. In admin, under SwissUp -> ProLabels, I'm attempting to add a new label, but my product attributes are not listed in the dropdown. Only the out-of-the-box product attributes appear to be listed. My expectation is that this should show all extensions. For example, if I have a "fabric" attribute or "custom product" attribute, I should be able to choose this in the criteria. Has anyone successfully configured ProLabels with an attribute you created?