How to get (filter) a specific number (from/to) of Firebase Realtime Database records?

Question

JavaScript

Is there a way to filter posts from the Firebase database, for example by tag, so that posts from 5 to 10 are selected (for pagination)?

Here is the structure of the database:


Here is the query:

loadPostsByTag(tag) {
    return this._database
      .ref("/portfolio/")
      .orderByChild("tags/" + tag)
      .equalTo(true)
      .limitToFirst(5)
      .once("value")
      .then((snap) => Object.values(snap.val()));
}

If you specify the startAt('5') parameter, then an error is generated that equalTo and startAt cannot be used in the same query...


Question: Is there any way to filter records in this way immediately when querying the database, rather than getting all the records at once and filtering on the client?
Thanks!)