Hi lundweb, thanks for raising this case, that’s a pickle. Because it’s an array we could detect it (the array type) and then spit out anything inside it but since this array is multi-dimensional whatever we spit out is still going to look like a mess.
In your case it’s probably better to get in touch and I can spin a custom add-on for Store Exporter to properly format and export those custom Product tabs in separate export columns based on a map (e.g. a Post Type, Term Taxonomy, etc.), contact us via Premium Support 🙂