this is not supported yet, and i am not sure whether it is on roadmap.
Currently there is no workaround neither.
When applicable please mark the appropriate replies as CORRECT. This will help community members and Qlik Employees know which discussions have already been addressed and have a possible known solution. Please mark threads as HELPFUL if the provided solution is helpful to the problem, but does not necessarily solve the indicated problem. You can mark multiple threads as HELPFUL if you feel additional info is useful to others.
*Apologies, this is my first post*
There is a way around this, assuming you are linking to a QVW - create a variable in the script with the text you need and add the date variable at the end. For example:
LET vToday = Date(Today());
LET vEmailSubject = 'Text for email - ' & Date('$(vToday)');
Within NPrinting, add the variable as a tag (to the right of the subject field within the task), or manually type in '%%Variable_Connection_vEmailSubject%%' (assuming you use the same naming convention). Selecting through the tag is preferable, though.
I hope this helps, if you've not already been able to fix this.