Hi there!
We appreciate your interest in creating a bundle for your products. At this time however, this is not a currently available feature within the publishing tool. To build this out, it would need to be internally built completely. I have shared your interest in seeing this come to fruition to the appropriate team on your behalf. We always appreciate this type of feedback as we want to continue working towards improving the Epic Games Store with our partners. If you have any additional questions or need any assistance, feel free to reach back out.