Read iOS Player as Percentage of USB Connection

Assuming I can get MFI approval for the project. hypothetically, of course, I want to know if there is a way to read / query an iOS device connected to USB for its charge / battery state WITHOUT the need to have a dedicated app installed on the iOS device. At the opposite end of the line, I want to receive this information one by one on the microcontroller via the UART. Is this type of query kept so low?

Most of the information in the UIDevice class for accessing battery information doesn't help me as I want to access the state of charge without an iOS app on the device. I also couldn't find this functionality in Framework for External Devices.

iTunes displays the iPhone battery level when connected, and with iOS 8 + Yosemite, the Mobile Hotspot feature also displays the battery level of my nearest iPhone. Therefore, I know it is possible. I just want to know if this is available for any developers other than those in apple.