Most of the appliance touch ups available will discolor if used in very close proximity to the heating elements often ending up looking worse than the chip. I don't know of any which will withstand the direct heat in those areas.
If the chip is away form the elements you could give a touch up a try as long as you keep possible discoloration in mind. The only other options would be to remove the cooktop panel and have it reporcelained or replaced (if still available).
You can find some appliance touch ups at the following link:
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