Feed custom field into Woocommerce Google Product Feed

We are a small bookstore using Google Shopping and have noticed that Google Product Feeds is not pulling the author and artist names from our two custom fields that appear on each product page. Is there any way to make it so the Woocommerce Google Product Feed pulls a combination of three strings — cf_author & cf_artist & the full product description — for the Google Product Feed description? Making it so Google is pulling creator information is vital to our business plan and we have hundreds of products.

Here is an example of one of our product pages