I understand wanting to be vague. On one hand I believe that when we say what we want, it calls it from the universe. On the other hand, specifics are what sets people apart and THAT is what I recommend practicing as you prepare for the job search ahead.
What may help is if you and WHY to your WHAT. For example you may say I want to work on the moon which is your WHAT but if you explain, because you want to fly and aim for greater heights, then your WHY is how you can evaluate other opportunities that can still get you where you want to go.
Also consider this: The crazy thing about business is that you can write your marketing message for a target end-user (persona) that is a pink-haired dinosaur (example) but that doesn’t stop other people (like the blue-haired beluga) from buying into your vision or product. What the specifics also allow you to do is create a focus so that you can more confidently go in the direction of your dreams.