Don’t get me wrong. Apple removing audio jack was the biggest facepalm in smartphone history. And you can thank it for not being able to make an upgrade without sacrificing audio jack (and SD card too :/). But USB-C is getting standardized everywhere now (laptops, smartphones, etc.). What makes USB-C earphones not worth the switch?
Did you actually find such an adapter for Android? Last time I checked I couldn’t. Still sticking with my trusty Note9 and wired headphones.
There are various types of dongles. If you want something compact for 3.5mm there are things like this: (greek site)