I am using iOS 12 on my iPhone 6 with VoiceOver.
When I look into the Settings / Battery under Battery usage for apps, I see a list of the apps that have used the battery, but I don't see how much battery each app has used. There is just the name of the app and no percentage or number.
I can change to the "Activity" setting to see how many minutes each app has used in the background and with the screen open, but this isn't the battery usage.
Is voiceOver missing some information here and perhaps not telling me about some graphical data?