This question has been answered by multiple community members. See the first response.
$doc_id = $modx->getOption('doc_id',$scriptProperties,$modx->resource->get('id')); $tv_id = $modx->getOption('tv_id',$scriptProperties,0); $output = ''; if (!empty($tv_id) && $tv = $modx->getObject('modTemplateVarResource',array('contentid'=>$doc_id,'tmplvarid'=>$tv_id))){ $output = $tv->get('value'); } return $output;
[[getRawTVValue? &tv_id=`25`]]