Ah, that's great! I use Duet (paid app) for this at the moment but it's disappointingly flaky - it seems to only work sometimes and when it does, you'd better not touch anything unless it resets and stops working again. Worth the setup effort for longer sessions but hardly practical for shorter ones on the go (which let's face it, is the main usecase). Having this native so it 'just works' out the box would be amazing.