The https://api.flutter.dev/flutter/dart-ui/StringAttribute-class.html is useful to attach certain attribute to a string for accessibility focus. This information is not sent as part of embedder API https://github.com/flutter/engine/blob/18750d2452519ebe006f935d4d054f15a4949890/shell/platform/embedder/embedder.h#L1115

We should add support for this