Halloween // Help! Pumpkin chai recipe needed

Hopefully this is a super basic question haha. With Starbucks launching their PSL yesterday I went to get a chai version and it was $7! We buy the tazo chai stuff from Costco so curious what to add to it (or what portions anyway) to make a solid PSL chai knockoff? Google didn’t turn up much that I could find that wasn’t making everything from scratch. Thank you and Happy Halloween! 🎃