Did a quick search and only see USB-C to 3.5mm (headphone jack) adapters. It's almost like you'd have to "double dongle" to that 3.5mm and then use the Apple 3.5mm to lightning adapter. Yuck. Not sure that would even work.
If I come across one, I'll ping you but I have not seen one yet in about 10 minutes of googling, without using multiple adapter/dongles.