Turn artboards into component instances (the reverse flow of components:)

Question: Any plugin/idea how I can pick several dartboards that have exactly the same structure and objects and turn them into instances of a (new) component?
Sample case: imagine I create a component (i.e. sidenav with links) within a flow. Now I want to create a new flow with slight differences on the same page. I want to detach the sidenavs and make them instances of a new component, which will link to the new flow screens.