将mongodb嵌套的数据结构结果简化为一个列表

Question

我正在运行聚合查询

db.collection.aggregate([
    {"$unwind":"$blocks"},
    {"$unwind":"$blocks.ports"},
    {"$match":{"blocks.ports.portType.function":"input"}},
    {$project:{_id:0, port:"$blocks.ports"}}
])

在此文档上

{ "blocks" : { "ports" : {"portType" : { "function" : "input"}  }  }  }

我以嵌套结构的格式获取结果

{"ports":{<first-key>: <first-value>, ...}},{"ports":{<first-key>: <first-value>, ...}},...

是否可以忽略此嵌套结构并直接获取包含所有字段的端口列表？

{<first-key>: <first-value>, ...},{<first-key>: <first-value>, ...}