No it isn't possible, because a static library is not the same as a "bundle".
A bundle is a directory that may contain all manner of files including resource files (xib), executable files and static libraries. It exists on the filesystem as a group of individual files.
A static library is a single file that contains classes, code and variables that were linked together by the library creator. It does not "contain" other files, it is essentially a database of compiled code.
Although it would be possible to put the data for the xibs in there, Xcode would have no way of knowing that it was in there, as it looks for them as individual files on the filesystem.
In Mac OS, you may create a "Framework" which is essentially a bundle of code, resources, settings etc which may be reused by multiple projects. However, Apple does not seem to support custom framework creation for iPhone OS.
Bundles
https://developer.apple.com/library/content/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html#//apple_ref/doc/uid/10000123i-CH101-SW1
Static Libraries
http://en.wikipedia.org/wiki/Static_library
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