Jsonata execution through library

 https://stackoverflow.com/questions/67056785/why-does-map-not-output-an-array-in-case-the-input-array-is-one-in-length

var json = { "projectIds": [ 1 ] }
var result = jsonata('projectIds[].{"projectId": $}').evaluate(json);
console.log(JSON.stringify(result))

<script src="https://cdn.jsdelivr.net/npm/jsonata/jsonata.min.js"></script>