ACFML + StoutLogic/acf-builder

You can translate custom fields added with stoutlogic/acf-builder with ACFML (WPML Advanced Custom Fields Multilingual). Just add ‘wpml_cf_preferences’ to your field options.

$banner = new FieldsBuilder('banner');
$banner
    ->addText('title', [
      'wpml_cf_preferences' => 1, // 0 = Don't translate, 1 = Copy, 2 = Translate, 3 = Copy once
    ])
    ->setLocation('post_type', '==', 'page');

0 = Don’t translate, 1 = Copy, 2 = Translate, 3 = Copy once