Support custom fields from woocommerce-product-addon & Crocoblock/JetEngine

Hey Mark, thanks for all your hard work on this.

It would be great to be able to show custom product meta fields that are attached to orders. This is the plugin that I use the Pro version of: https://wordpress.org/plugins/woocommerce-product-addon/

If you need access to the Pro version, don't hesitate to reach out.