Trigger Followup events via webhook

[Carleslc]

Hello, how can I trigger an event from my webhook server to Dialogflow? I need that to perform slot fulfillment via webhook.

This is the reference in Dialogflow docs:
https://dialogflow.com/docs/events#invoking_event_from_webhook

Here is a temporal solution using official Node.js library:
actions-on-google/actions-on-google-nodejs#64
But I don't know how to apply that using this library.

Here is a recent pull request to the official Node.js library adding this feature:
actions-on-google/actions-on-google-nodejs#105