You can start using the JS Dev Environment here, found here: https://github.com/proofgeist/js-dev-environment
And a blog post describing its purpose: https://www.geistinteractive.com/2021/06/29/writing-js-better-for-fm/
Jason Young at Seedcode talks about how to work with a JS Dev environment in WebDirect here: https://www.seedcode.com/filemaker-19-hosted-webviewer-add-on/

Here's the link for the Office Hours: https://calendly.com/jeremy-evangelist/js-dev-environment-office-hours