Using Custom Fields with WooCommerce Product Table
GitHub - kharissulistiyo/WooCommerce-Custom-Product-Data-Fields: Simple framework which will help you to build extra product data fields, e.g. secondary product title, vendor info, custom message for individual product, etc.
WooCommerce Advanced Custom Fields: A Quick Guide
How to add a text field to a product in WooCommerce (in 2024)