Thanks! The hole is the key access for my BOLT hood lock. It's paired to my ignition key and works great. Not only do I feel more secure knowing any theft is deterred, it also has eliminated any hood flutter I had.
Bolt 7026128 Jeep Wrangler JK Hood Lock https://www.amazon.com/dp/B00VGX2PTE/ref=cm_sw_r_cp_api_i_9YP9AQ4KXPEGPV7WWMTD?_encoding=UTF8&psc=1