@jonasvorwerk – any luck with this?
I too would like to be able to grab and store the Google Places ID in the WP database along with the lat/lng values.
I’ve been working with your code to try and use AJAX to pass a value to a filter function with
add_filter('acf/update_value/type=google_map', 'my_acf_update_value', 10, 3);
but not having any luck.