Normal touring fork eyelets consist of a threaded metal insert that is brazed into a hole drilled through the fork or it is brazed onto the face of the fork with no drilling. A local framebuilder can add one to any fork. I would advise the one without any drilling. I had one of these Rack Carrier Bosses brazed to the rear of my roadbike and its works very well.
Most touring forks have twin lower eyelets for rack and fenders. Tubus racks can fit to the single lower eyelets and come with an additional fender eyelet. Their Tara model is a very good one and the company also make the best bolt-on adapters.

If you just drill a fork and put a bolt through, you can crush the tubing.