I have a collection of the form

{ id : 1,
  data: [ [ { name : "alice" }, { name : "bob" } ],
          [ { name : "dan" },   { name : "rob" } ] ] }

and the structure of the array has meaning. How would I update the first element ([0][0]) and set name = “alex”. I’ve seen many questions addressing how to update array elements that match a query but not specific elements. To be clear, after the update, the record should look like this:

{ id : 1,
  data: [ [ { name : "alex" },  { name : "bob" } ],
          [ { name : "dan" },   { name : "rob" } ] ] }