Products structured data issues detected

Search Console has identified that your site is affected by 5 Products structured data issue(s):

Missing field 'aggregateRating'

Missing field 'review'

No global identifier provided (e.g. gtin, mpn, isbn)

Missing field 'brand'

Missing field 'description'

I understand that these are Warnings and not errors, but realistically, what am I supposed to do about them? If the fields are missing, surely shouldn’t this be down to WooCommerce not having the correct markup to cater for them?

I’d like to know what I can do to validate and clear these warnings please.