It's actually no longer possible on Android, without jumping through significant hoops:

https://android-developers.googleblog.com/2016/07/changes-to... https://news.ycombinator.com/item?id=12061320 https://github.com/mitmproxy/mitmproxy/issues/2054

And it's really not the sort of thing your average non-technical user is likely to do - and trust me, having supported these users before, it's likely to go horribly wrong if you try providing steps for them.