Hi,
Unfortunately the ACF get_values function will only work within a post/page context. That means, it will likely get the values only if the search is placed within the post/page content field. I’m not sure why it works like that, but there is apparently no solution for that yet. I have looked through all ACF functions, all of their API and documentation, but found nothing, unfortunately. The best way in this case is to manually enter the values.