While targeting by attributes (in Feature Flag) instead of

{
  "school_ids": {
    "$elemMatch": {
      "$eq": "someIdToMatch"
    }
  }
}

Can I write

{
  "school_ids": {
    "$in": [
      "someIdToMatch",
      "AnotherID",
      "YetAnotherID"
    ]
  }
}

??

That notation looks correct to me

Cool. Thanks

I did something like this and it automatically converted it to $in query:

"language_ids": {"$in": [1, 8, 3, 9, 13]

I think both will work

Yeah it works.