Adding custom content to Product Additional Information tab

Solved,
as I wanted to add a WYSIWYG custom field and I did not find a way to edit the Additional Information tab via hooks, neither to add it as custom field for product variations (as explained in this nice tut https://www.remicorson.com/woocommerce-custom-fields-for-variations/)

I just copied template product-attrubutes.php file from woocommerce to my theme and I’ve added the custom field at the end of the file.

Anyway, I would prefer doing it with an hook or a filter, without editing templates file, so I don’t have to worry about my theme files to be updated.
So if you have any hint on how achive this, I’m glad to read it.

To avoid modifying and adding template files in the future, here’s how to hook into the attributes listed under the Additional Information tab and add a new row to the table in that section. This example code adds a new row to the table for an ISBN label and number:

add_filter( 'woocommerce_get_product_attributes', 'mycode_display_extra_attribute', 20 );
function mycode_display_extra_attribute( $attributes ) {

	$attribute = array(
		'name'         => 'ISBN',
		'value'        => '9780811222631',
		'is_visible'   => '1',
		'is_taxonomy'  => '0',
		'is_variation' => '0',
		'position'     => '10',
	);

	$attributes['my_isbn'] = $attribute;

	return $attributes;
}

Hope that helps!

Eric