This is possible only via making custom function, but it falls outside
support and possible only as paid work. Price will be $50

No, I want this for  external products only

but this will work for all products

https://rehubdocs.wpsoul.com/docs/rehub-theme/shop-options-woo-edd/how-to-make-classified-site-on-woocommerce/

Hi,
For external products I want to show vendor contact details instead of link to the product.
How can I achieve this? Other product types should have the usual fields