easy-watermark/placeholders/load

I am trying to make a custom placeholder. Is this snippet in active theme function.php still works. Tried to debug in a various ways – seems that not.

Snippet bellow. Thanks

add_action( ‘easy-watermark/placeholders/load’, function ( $resolver ) {
// Add custom placeholder instance to the resolver.
$resolver->add_placeholder( new FavoriteColorPlaceholder() );
} );