Persists available item list information (item_list_id, item_list_name, index) or creates item_list_name from a capturing ecommerce event along the purchase funnel for easy item list attribution.
Published in https://tagmanager.google.com/gallery/#/owners/trakken/templates/gtm-web-variable-ga4-item_list_attribution
- FIX: issue that sometimes the value in items was not overriden if it existed already.
- first version