RASA slot setting using Tracker object

Question

Hi am trying to set slots using tracker object from inside custom action submit method.

    def submit(
        self,
        dispatcher: CollectingDispatcher,
        tracker: Tracker,
        domain: Dict[Text, Any],
    ) -> List[EventType]:
        tracker.slots["sample"] = value
        print(tracker.get_slot("sample"))
        dispatcher.utter_message("action is submitted")
        return []

this is the submit method of FirstAction and when I submit the slot inside this action method is getting setting but after I try to use the slot inside another Action the output is getting as None. I know when we send the return type of the submit as

    return [SlotSet("sample", value)} 

the slot is getting set but when i try with tracker.slots["sample"] = value the slot value not persisting between the actions, I am writing a function with parameter as tracker so I need a way to set slot using tracker object or any solution to set slot from one helper function, So is there any way to persiste tracker.slots[key] = value in between actions?