If you choose the enquiry modal to open you can set an enquiry title, position and add anything inside the enquiry modal like a CF7 Shortcode. Any other shortcodes or even a custom HTML-form works here too.
If you choose a CF7 Shortcode, you can take advantage of the special mail tags.
Is it possible to use sku fields and product field on Gravity form ?
Yes of course you can use the enquiry fields with gravity forms in your WooCommerce store.
What would the configuration look like in Gravity Forms?