What is the correct way to use the aggregate function to combine data from multiple collections?

Question

MongoDB

Hello.
There are several collections
Users
Team members (where there is a link to a user)
Team messages (where there is a link to a team member)

how to properly build a pipeline to collect related data on a user

Пользователь
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    - сообщения команд

db['users'].aggregate([
        {"$match":{"chat_id":user.chat_id}},
        {"$lookup":{
            "localField" : "_id",
            "from" : "team_members",
            "foreignField" : "user_id",
            "as":"member" 
        }}])

logic suggests that instead of "team_members" you need to use a nested pipeline

, maybe I'm driven and there is nothing criminal in the phased formation (first select team members, and then attach everything you need to this particular collection)