Worpdress php code snippet to insert Woocommerce PRoduct SKU into a form

[login to view URL]~firetaildaq/product/usb-602/ (simple product) [login to view URL]~firetaildaq/product/wifi-501/ (variable product) These are example [login to view URL] the bottom of the page is an enquiry form. It uses Fluent Forms which provides an Action Hook for that form that looks like this: add_action('YOUR_CUSTOM_HOOK_NAME', 'YOUR_CUSTOM_HOOK_NAME_callback', 10, 1 ); function YOUR_CUSTOM_HOOK_NAME_callback( $form) { // do what ever you want } I would like a field that is prefilled with the Product SKU. It must work whether the product is a simple or variable product. You can add the field dynamically, or create the field in the form builder and add the SKU dynamically to the field. I don't mind, whichever is simplest.