Baking concentrate using Hard Alcohol ex Jack Daniels
You can't. The compounds which make Jack Daniels taste like Jack Daniels are alcohol soluble and highly volatile. If you try cooking off the alcohol, the taste will evaporate together with the alcohol. 

If you are thinking of "rum essence" for baking, that's not derived from rum at all. It's simply ethylformate, and it's produced in a lab. 

You can mix xanthan gum or something else with alcohol, but it won't make it a concentrate in any way. In fact, it is likely to make the taste somewhat weaker, as these thickeners have a tendency of trapping taste.