I just discovered this myself as well
From what I can tell, there is no other way in the current version of Krita. I found this feature request thread which has some more info about it. As I mention in that post, it looks like bundle creation is pretty much the only place in the Krita UI where you can’t search/filter by name or tag. For some reason.
In semi-good news, it looks like there’s an improved “bundle editor” in the works (or already complete?) for a future release of Krita. More info in this thread and a related blog post of the author.