How to clear/remove/delete due_date values from ToDo List

Configuration
,
1

Problem: I have a third-party app that adds today’s date to all new tasks. This is what I want, except for when I add an item to my Shopping List. I therefore am trying to use Home Assistant to remove all due_date values from items in my list todo.shopping

Approach: I have the script below which happily loops through all the items and can modify the due_date, but having tried many options like Null, null, None, none, I cannot get the due_date removed. Any options are greatly appreciated.

alias: Clear due_date from Shopping List items
sequence:
  - service: todo.get_items
    metadata: {}
    data:
      status: needs_action
    target:
      entity_id: todo.shopping
    response_variable: shopping_list_items
  - repeat:
      count: "{{ shopping_list_items['todo.shopping']['items'] | count }}"
      sequence:
        - service: todo.update_item
          target:
            entity_id: todo.shopping
          data:
            item: >-
              {{
              shopping_list_items['todo.shopping']['items'][repeat.index-1]['summary']
              }}
            due_date: "2024-01-01"  <-- this is where I think I need help. How to I clear the due_date????
description: ""
2

If anyone comes back here, my temp fix was to run this when new tasks ae created, and every night, and set the due_date to a few years in the future so these were pushed to the bottom of my task list.

I then also switched across to Todoist which had a better UI for adding new tasks.