protected function prepareFieldValue(array &$field_value)
    {
        $this->setItemImages($field_value, 'field_value', $this->image);
        $this->setItemTranslation($field_value, 'field_value', $this->translation_entity);

        if (!empty($field_value['images'])) {
            foreach ($field_value['images'] as &$file) {
                $this->setItemTranslation($file, 'file', $this->translation_entity);
            }
        }
    }