note: Harlowe has been deliberately designed by its Developer to restrict an Authors ability to use JavaScript to enhance the default functionality of its engine.
If by “watch” you mean having the Harlowe base project send data to a file hosted on a web-site (like a Google Sheet) then generally that would involve the project using JavaScript to communicate with an server hosted web-app which would update such a file, and such functionality does not come included with the Story Format engine.
An individual named John Stewart wrote an article explaining how send data to a Google sheet from a Harlowe project. However it appears that since then two things have occurred:
- Google changed the requirements for programmatically updating a data sheet.
- Recently released versions of Harlowe have increased the restrictions on JavaScript usage.