Answering this essay seems fairly straightforward. However, I urge you to run your response by people in your life (or ideally, a consultant), who aren't familiar with your job. It's important to use universal language that will be understood by all members of adcom. Jargon and acronyms will just be a barrier to them understanding your greatness.

Let's look at the short answer question:

Briefly summarize your current (or most recent) job, including the nature of work, major responsibilities, and where relevant, employees under your supervision, size of budget, clients/products and results achieved.

In addition to keeping the language simple, there are a few other points you need to get across.

Tell them the level you are working at: this is often indicated by budgets and employees, but if your industry uses some other measure, share it. The point of an MBA, for employers, is to access a large body of vetted candidates. Here, INSEAD is seeing how VETTED you are already by your employer.

And of course, don’t forget the results part. While you don’t have to go into long-winded stories here, just give them a bit of context around the resume highlights that are already in STAR format. Bring a bit of life to those, but of course don't copy and paste. Results are best when quantitative and speak to motivations of making money, saving money, and saving time.

For many, that involves a certain amount of modeling: what would have happened had you not done that "IT" thing you did? Would it have jeopardized your organization's ability to make money? Think creatively about how to demonstrate how you added value.