I am trying to add a custom field to a WooCommerce product that autocompletes the field input based on already saved products.
As of today, it is not possible with Toolset and it will require extending WooCommerce.
It would need some custom coding to make it happen. We have some recommended list of service providers here if you would like to take a look: https://toolset.com/consultant/
However, it's possible to Add Custom Fields and Taxonomies to WooCommerce Products:
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