you would have to go into the logistic robot codes and...
...hm...it's a maybe. but only a maybe.
if you have two chest containers, you can detect logistic network requests and potentially send them to a set of logistic chests inside the factorissimo, and if the logistic network inside the factorissimo has a request, you actively set that within the "smart container" using the new "set requests" feature within 0.14. just match a combinator's signals to the internal requests within the internal network and "connect_neighbour".
it'd be a bit haphazard, but you could have another connection type within your factorissimo API that synchronizes a chest outside your building, and another inside the building.
I'd think you'd wanna have two chests outside the factorissimo, a requester and a passive provider, and another pair inside the building, and move items from the requester to the passive provider (sort of trading between the two surfaces)
though I think you may have to come up with a way to limit the requester chest from taking from the passive provider? I dunno.
any thoughts? maybe it could be a higher tier of building.