Maintaining a list with rasa

I want to to maintain an array of strings/objects in rasa’s tracker as a “list” of objects that i want to add or delete or edit or view based on the interaction with user. The Rasa Masterclass Handbook: Episode 6 has some details to be fair, but it will be great if I can get step-by-step instructions. I also want to preserve this list across sessions. So, the list has to persist.