WooCommerce Product Query by Author

functions.php

<?php 

add_action( 'woocommerce_product_query', 'my_custom_query_by_author', 10, 2 );
function my_custom_query_by_author($q, $product){
    
  $author = $_GET['creator']; // Author ID param
  
  if( isset($author) && $author != '' ){
    $q->set('author', $author);
  }
  
}