Category Product Feed XML

Hi,
I need to insert only the product category in the XML Feed.

I put this feature in my theme’s functiosn.php, but the category link is also placed

add_filter('aepc_feed_item', function($fields) {
	$product = wc_get_product($fields['g:id']);
	$fields['g:product_type'] = $product->get_categories(); 
	return $fields;
});

How can I do?