In my TNG prequel novel The Buried Age and my Titan novels, I clarified that Deanna was trained as a "contact specialist" as well as a counselor. As we often saw in TNG, she was an expert in alien cultures (see "The Big Goodbye" where she coached Picard on Jarada greetings, or "Darmok" when she researched alien mythologies alongside Data), and I codified that as a specific part of her job, to explain why that was, well, part of her job when she was nominally the counselor.
I was thrilled when that term I coined made it into canon on Discovery as "first contact specialist," no doubt thanks to my friend and fellow novelist Kirsten Beyer being on the writing staff.