Sounds like you may have a problem with that individual burner valve if all the other burners work good and it ignites good at that burner just no gas being released....Here's a parts page #314 is the part you most likely need. Make sure if you replace it to do a test to make sure you did it right and it has no leaks........use a can of windex or bubbly water after you turn the gas valve at the wall back on after the repair. Good luck
Control Panel parts for GE J2S968SEK3SS - AppliancePartsPros.com