Checking trigger/collision of another gameobject separate from the one the script is on

Not sure how to word this exactly, so I'll just give a sample of code. I'm just wondering if there's a way to do this without making 2 scripts. I have a simple AI that paths around, and I want it to chase the player when he walks into a collision zone. So this script would be on the enemy

 void onTriggerEnter(Collider coll){
         if(coll.gameObject == player){
                //do stuff
          }
      
          //so is there a way to do something like this, in this script?
          it(chaseArea.coll.gameObject == player){
                //do different stuff
                //basically checking to see if someone collided with the chaseArea GO in the same script
          }
 }

Is there a simple solution to this? Or do I just need to make another script and reference it? I've been using unity for a while and I've never managed to figure this one out.

Thanks!