Show authors of .pbxproj, .xib, .storyboard in Xcode?

Is it possible to show Authors in files that are not .swift, .m, .h etc. in Xcode 11+?

For example .pbxproj, or .xib or .storyboard Interface Builder files.

"Show Authors" via ⌃⇧⌘A is not working, as it does for text source files.