Flutter Widget to Native UI

I am new to flutter and I have a big problem to resolve. A native SDK
that I want to wrap into a plugin expects as input a Native View. I was wondering if there was a way in Flutter to start from a widget and then transform the Dart Widget into a Platform UI View. I have checked the Platform Views but they are not solving my issue since I would need the other way around translation. Do you have any idea if there is a way to Translate/Convert a Widget into a Native UI component?