Advance Custom field Attribute Mapping.

I was searching for a way to map target attributes with advance custom fields inside products. i researched a little and found this : Use case 7: Mapping Custom Fields to Google Attributes

But im still unsure below im sharing the example : for example i created a field in acf with name “ACF_FIELD_NAME” so if add the data in that field on my products and add_filter in functions.php it does display the field inside target attributes but will it fetch the data?

add_filter( ‘woocommerce_gla_attribute_mapping_sources_custom_attributes’, function( $values ) { return array_merge( $values, [‘ACF_FIELD_NAME’]); } );