It does not require rooting. It shows connnections per app, and how much data has been transferred to each of those connections.

What I tend to do is: install an app → block it before running it the first time → look at every connection attempt made (usually first through ipv4) → wait a bit more until apps attempt connection through different protocol (ipv6 or U) → block anything I don't like, including ads, analytics, etc → tell NetGuard to now allow the "legit" connections to be made and start using the app.