The WooCommerce Custom Fields plugin is bundled in Rey.
Note: Please know this plugin is different in purpose and functionality versus ACF (Advanced Custom Fields).
WooCommerce Custom Fields allows you to create custom product, checkout, order and user fields, provide and gather additional information in a structured way, and sell configurable products, product add-ons and extra product options. Build, manage and optimize your online store for a premium user experience, and make every field work for you.
To install it, head over to Rey > Plugins Manager and install it from there eg: https://d.pr/i/ds5w1t . You can create the field types you want afterwards
You can find out more on how to Manage the fields, but for more informations and documentation, you can head over to its Knowledge Base , but please know that for personalised support you will need to purchase your own license for it.