Can I make a stopwatch that runs on an app in the background while on other steps?

I want to create a dashboard that overlooks each station with a stopwatch. It starts and stops by station.

I would build this by pulling timestamps instead of running a background app. Create a table of start and end times for all stations. Populate the table with a variable. There’s a slight variation on how to set it up in this post on how to work with timers in the expression editor