[Feature] Add display the Volume level (%) in the Notification Drawer

[Birraque]

I would like to suggest an improvement. Currently we can enable display the brightness level (%) dragging the slide bar in the Notification Drawer. We can also enable display the volume level (%) dragging the slide bar or by pressing the volume buttons on the screen right side. But when dragging the slide bar in the Notification Drawer none percentage is displayed. Could you add this option in the custoMIUIzer Notification Drawer configuration screen (screenshot below)?

NOTE: custoMIUIzer 13 (test version)