Thanks to the lockdown, I've finally wrapped up the long work on a Slack plugin that helps you find the location of coworkers and meeting rooms: https://www.slashmap.com/.
I used Go on the backend (rewritten from Node) and Vue on the frontend.
How it works: first, you upload a picture of your office layout using the web UI and mark everyone's locations. Then if you send "/map @JohnDoe", the plugin will return a map with the location marked on it. It works for meeting rooms and other locations as well.
Now the plugin has dozens of users and were featured in the Slack's app directory as "New and noteworthy".
If you have any questions, feel free to ping me at contact@slashmap.com :)