--- /dev/null
+/**
+ * Implements hook_options_list_alter().
+ */
+function {{ machine_name }}_options_list_alter(array &$options, array $context) {
+ // Check if this is the field we want to change.
+ if ($context['fieldDefinition']->id() == 'field_option') {
+ // Change the label of the empty option.
+ $options['_none'] = t('== Empty ==');
+ }
+}