Is it possible to create a new attribute called Cover Image so that vendors know that the image they put here is the image that will serve as their cover image?
Thanks for your suggestion. There’s no such feature yet, but it’s possible via customizations, e.g. if you add a custom Attachment attribute and use its URL as a background for a custom HTML section.
Please try to add custom vendor attributes of the Attachment type in Vendors/Attributes. Then it is possible to get attachment URL in HivePress vendor templates parts in this way and do further customization
$attachment_id = $vendor->get_your_attribute_filed_name();
$attachment_url = wp_get_attachment_url($attachment_id);
If you are not familiar with the code customization, then please consider hiring someone for custom work https://fvrr.co/32e7LvY