So create a index.html in that folder. Code that page with the code below. (modify the part says yourip to your actual ip)
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Redirect to ftp</title>
<meta http-equiv="refresh" content="0;URL='ftp://yourip'" />
</head>
<body>
</body>
</html>
so when you go to domain.com/text it will automatically send you to index.html and index.html will forward you to your ftp.