Ignore Product Meta data from WooCommerce Importer

importer.php

<?php

add_filter( 'woocommerce_product_import_process_item_data', 'wc_ignore_meta_in_import_if_non_value' );

/**
 * Ignore the meta if value is empty
 *
 * @param array $data Data.
 *
 * @return array
 */
function wc_ignore_meta_in_import_if_non_value( $data ) {
  
  $ignore_with_key = array( 'meta_key_1', 'meta_key_2' );
  
  if ( isset( $data['meta_data'] ) ) {
    foreach ( $data['meta_data'] as $index => $meta ) {
      // Don't do anything if meta key is not in this array. 
      if ( ! in_array( $meta['key'], $ignore_with_key, true ) {
        continue;
      }
      
      if ( null === $meta['value'] || '' === $meta['value'] ) {
        unset( $data['meta_data'][ $index ];
      }
    }
  }
  
  return $data;
}