How to combine two or more WP_Query?

I have two WP_Query like these:

Searching by s:

$query1 = new WP_Query([
  'post_type' => 'product',
  's' => $searchStr
]);

and searching by metabox:

$query2 = new WP_Query([
  'post_type' => 'product',
  'meta_query' => [
    [
      'key' => 'my_meta_key',
      'value' => $searchStr,
      'compare' => 'LIKE'
    ]
  ]
]);

How can I create a query to relate these two query by “OR”, like:

`$query1 OR $query2″ ?