[TYPO3] Retrieve session data with stdWrap?

[Douwe Doornbos]

Hi,

How do I retrieve Typo3 session-data ($TSFE->fe_user->getKey('ses', 'key')) 
or a session variable ($_SESSION['key']) with Typoscript stdWrap?

I want to create a menu for pages with uids 6 and 12. The value '6,12' I 
would like to retrieve from a session variable.

temp.menu = HMENU
temp.menu {
  special = list
  special.value = 6,12
  1 = TMENU
  1 {
    ...

I was looking for something like
  special.value.data = TSFE: fe_user->sesData['key']

With kindly regards,

Douwe.