A little Python script to batch download Shopify metafields. (Coming Real Soon Now™: upload!)
From shopify.dev,
The metafields object allows you to store additional information for products, collections, customers, orders, blogs, pages and your shop. You can output metafields on your storefront using Liquid.
Great! And we'll find this in the admin web interface like all the other shop content, right? Wait... no?
There are several apps in the Shopify App Store that you can use to manage your metafields.