is it possible to filter child elements in a query? e.g. in the query below I’d like to return only documents where `deleted != true` ```*[_type == "event"] { _id,...

*[_type == "event"] {
      _id,
      _key,
      documents[] -> {
        ...
      }
    } 

*[_type == "event"] {
      _id,
      _key,
      documents[]->[deleted != true]{
        ...
      }
    }

*[_type == "event"]{
  _id,
  _key, // there shouldn't be a _key in a document?
  "documents": 
  	select(
    	count(
      	documents[]->[deleted != true]
	  	) > 0 => documents[]->[deleted != true]{...}
	)
}