Partial virtual packages support in packages.debian.org

Hi, I saw that only some adep/dep link of virtual packages are 
supported, for example:

https://packages.debian.org/source/sid/cjs


 >     adep: dh-sequence-gir
 >         virtual package provided by gobject-introspection
 >
 >     adep: dh-sequence-gnome
 >         Package not available

https://packages.debian.org/sid/libcjs0


 >     dep: gir1.2-gio-2.0 [not alpha, hppa, ia64, m68k, sh4, sparc64]
 >         Package not available
 >
 >     dep: gir1.2-girepository-2.0 [not alpha, hppa, ia64, m68k, sh4, 
sparc64]
 >         Package not available

As spotted by people in debian-devel IRC seems that is working only for 
unversioned Provides, is possible have working also for the versioned 
ones please?

It would also be useful to have a list of any provides in the package 
pages, for example together with or next to the depends, recommends, 
suggests, enhances lists.

Currently for checks you have to go and look for the sources of the 
packages, having complete implementations in packages.debian.org would 
save time.

Thanks for any reply and sorry for my bad english.

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