MongoDB sharing user data best practices - database

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What is the best way to access nested user data as another user with MongoDB?
I have not been able to find any info on what the best practices are for being able to access user data from another user.
Given that MongoDB is document based storage I would assume that this is the best way to store data that is coupled to a user. My issue is that I am not sure what the best way would be to allow users 2 and 3 to access the list that is owned by user 1.
{
"_id": 1,
"username": "johndoe",
"hashed_password": "xxxxx",
"lists": [
{
"id": 1,
"name": "list 1",
"owner_id": 1,
"shared": true,
"shared_users": [2, 3],
"items": [
{
"name": "item 1",
"description": "item description"
},
{
"name": "item 2",
"description": "item description"
}
]
},
{
"id": 1,
"name": "different list",
"owner_id": 1,
"shared": false,
"shared_users": [],
"items": [
{
"name": "item 1",
"description": "item description"
},
{
"name": "item 2",
"description": "item description"
}
]
}
]
}
I was thinking that separating the users and the lists would be the best way around this as then each user can have a reference to each list as either the owner or a shared viewer. But I understand this is not an ideal solution.
{
"_id": 1,
"type": "USER",
"username": "johndoe",
"hashed_password": "xxxxx",
"owned_lists": [{ "mapped_id": 5 }]
},
{
"_id": 5,
"type": "LIST",
"name": "list 1",
"owner_id": 1,
"shared": true,
"shared_users": [2, 3],
"items": [
{
"name": "item 1",
"description": "item description"
},
{
"name": "item 2",
"description": "item description"
}
]
}
I found this question that goes through some of the considerations from an app usage (read/write) perspective but not really much into accessing nested user data.
Should I then have 2 collections for Lists and Users or have them all in the same collection?
What would be the best way to achieve this?