Anyhow - I only need (allow) bold and italic text in the output.
So I created a simple “markdown parser” myself 
<?php
$text = preg_replace("/\*\*(.*?)\*\*/", "<b>$1</b>", $values->project_text);
$text = preg_replace("/\*(.*?)\*/", "<i>$1</i>", $text);
echo $text;
?>
