[{id:1,myData:[[2,0,0],[0,0,0,3,0,0],[1,0,0,1,0,0,1,0,0]]},{id:2,myData:[[11,0,0],[0,0,0],[1,1,2]]}]

db.collection.aggregate([{$project:{sumData:{$reduce:{input:"$myData",initialValue:0,in:{$add:["$$value",{$sum:"$$this"}]}}}}}])