Quick question about session variables

My login page creates session variables through my server action page. the session name is ‘custId’ .
For the life of me i’m not sure how to add the variable result to my page using the data bindings.

Of course this works absolutely fine:
<?php echo("{$_SESSION['custId']}")?>
and returns the data as expected.
What would the wappler equivilent be?
not sure how to get server side variables to display on the page using the data bindings panel, something like

{{$_SESSION.custId}} ?

I’ve tried setting up a session manager, doesn’t work…

Any tips would be greatly appreciated!