Is there a way to index VTK Actors

I am developing a simple GUI where users can import multiple stl files and view them and interact with them in real-time. I am using QT (PySide6/PyQt) (TreeView model) for showing the list of stl files imported. Now I stumbled upon a problem, how to link the QT items (in the treeview) and vtkActors in the renderer. I am thinking about using vtkActorCollection, but if there is a way to index vtkActors, then I can directly link them to the QT items.