I have a scene (ItemBag) for a widget to reuse often that has a PanelContainer (search_out). The scene tree looks like this:

And in another scene (GUI) I'd like *ItemBag* instances to behave like a Container:
in the Scene Tree panel each child of *ItemBag* would end up in the PanelContainer search_out, like *Label* in the screenshot below.
Ideally the GUI Scene Tree panel would only look like this:

Of course I can enable Editable Children to each ItemBag, but that clutters the Scene Tree panel very much and visually identifying modifications of the instance remains hard.
I am thinking about using @export_node_path(Control)
in ItemBag' script to move Label in _ready()
but that is not scalable and looks convoluted..
How would you deal with such a situation with re-usability in mind?