Yes, I think the alias import command is the closest thing to what you are looking for. That is an item-by-item import to be clear, even though the resources are centralised and thus shared by all projects that link to them. By that I mean you can’t have a folder aliased into the binder in such a way that its contents are represented as binder items. There was a request for that a few years ago as I recall, but it’s not really something that would fit well into the architecture of the software.
I do quite like the idea given above of having a central mini-project that other projects are meant to integrate with. It’s not quite what you’re looking for in precise detail, it is still another project, but the integration can be tighter than you might be thinking.