Database
[{"_id":"5e43e7831bc81503efa54c62","id":"foo","checked":true,},{"_id":"5e43e7831bc81503efa54c61","id":"foo","checked":true,},{"_id":"5e43e7831bc81503efa54c63",id:"foo",checked:true,}]
Query
db.collection.aggregate([{$group:{_id:null,docs:{$push:"$$ROOT"}}},{$addFields:{allTrue:{$allElementsTrue:"$docs.checked"}}},{$project:{result:{$cond:{if:{$eq:[true,"$allTrue"]},then:"$docs",else:"$allTrue"}}}}])