I use a local VPN (apps below) to get some information about the traffic (first option does not support IPV6 based on my tests).
Haven't tested this on Android 8 yet.
I would be interested to see what other options there are.
[1]: https://play.google.com/store/apps/details?id=app.greyshirts...
[2]: https://noroot-data-firewall.en.uptodown.com/android/downloa...
[2*]: Was not able to find it on Google Play for some reason!