Another one, desktop webviews don't exist either. Everyone does something custom right now and there's an epic vent fest in one of their GitHub issues. This causes about 1 new package to get released every few months too that tries to address it.
Hey there - Flutter team member here. Support for integrating arbitrary non-flutter views/widgets (referred to as PlatformViews in Flutter terminology) is something we're actively working on at the moment, once we've got them landed, web views and video player support are top of our list in terms of views to add support for. We know people can't wait for this to land, and believe me, I can't wait for it to land either :)
PlatformView support is one of our top desktop priorities this year (along with multi-window support).
Hello, I'm from the Flutter desktop team. We're actively working on adding platform views to desktop, which will allow you to embed web views into your Flutter application. Stay tuned :)