In the previous Android versions, Google included the Ringtone and Notification volume together with the help of one slider. Now, according to the latest information by folks 9To5Google, the upcoming Android version (13QPR3 or 14).
The latest Android 13 QPR2 Beta 1 version which was released back in December, shows up the “Ring volume” and “Notification volume” sliders differently via navigating Settings > Sound & Vibration menu. There were a total of five sliders along with Media, Call, and Alarm volume.
If we talk about which Android version will get this. So in particular the QPR2 stable version misses the update even the current Android 13 version QPR3 (Beta 3) also dint got this. It seems the feature is all set to arrive with the new version. Check the screenshot below.
Possibly we may see these upgrades in the Android 14 version which is scheduled to be released in August 2023.