I'm not sure if it's a good idea to create a whole new Collection for your use case.
Why not choosing to use a different approach :
Let say you create 1 collection called "Lists" : it will contains your lists definition with for each an id, name, timestamp, creatorUID, etc...
Then for your Items, you can choose to create another collection which will contain every items of every "Lists" each Item having the Id of the List it belongs to. Or you can embed them as an array of subdocuments of your "Lists" elements.