Multisite wish…

I’m creating a multisite on the history of my work (very different kinds of information, multiple autors). I was very happy to see that his plugin has a multisite option, be it just mentioning the different sites. Would it be possible to create a tag-list over different sites in the multisite. So could I for example in the profile of a person in the genealogy create a link to where this person is linked in stories, in objects or in letters. If these have all their one subsite? Or could I make a tag map of all the names in a custom taxonomy list of all inhabitants?

It would make the information so much more dynamic and it would create possibilities to make links to local archive (custom taxonomy archival number).

It’s not a must have, but I sure would love to have this functionality!

Thanks for reading anyhow ??