How can I get screen time per desktop?

I have created three desktops - one for work, one for a side hustle, and one for game/entertainment. I want to know how much time I am spending on each. Some apps are used on multiple desktops, such as browsers, separate sessions on each desktop.

I see we can see how much time is spent on an app. But if multiple windows of an app are open, will not know on each how much time is spent. So cannot calculate how much time is spent on each desktop.

If this feature is not available, please consider it as a request.