Is it possible to set up a trigger condition of "rounds in zone?"

[Tree_Beard]

I am creating a ww2 CAS mission and I want the following situation to take place:

- My plane flies into the combat zone, triggering a red smoke marker on the roof of a house that I have designated as an enemy position.

-I do a gun-run, and if I manage to get rounds on target (into another small trigger zone placed over the house) I get a message that the enemy position has been suppressed.

The problem is that there doesn't seem to be a "bullets in zone" or "rounds in zone" trigger condition. Is there a way that I can achieve the equivalent effect?

Again - all I want to do is have rounds landing in a zone trigger a message to red coalition.  

[Exorcet]

Maybe with scripting.

If you're using triggers, you'll either have to use something like detecting a SHOT event in the zone, or detect damage to the unit you want suppressed.