Structured Data Markup - Can Products Reviews Data be Fudged?

so structured data markup for products includes the fields or tags 'review' and 'aggregateRating' - in Google Console I get warnings that a large number of my products have errors, those fields are 'missing' - I have a plugin that automatically allocates all the data required for json markup that picks up those products that have reviews from the database.

So the products mentioned do not have actual reviews - if I manually enter data for those fields does Google look on the actual product pages for validation a review exists or does it rely solely on the marked up data?

I figure having more products attributed by Google as 'products' in Google Console may help with ranking? ... yes/no?

cheers,