That's not a chip as much as a character mark
Unless your are familiar at wood finishing, it's hard to get a flawless invisible repair. Sometimes it looks worse if you are a noob.
I assume it's a see through finish: and you are worried about it spreading and want to seal it? Get some polyurethane varnish (make sure it's waterbase!) and put it on in very thin layers with an artists brush to gradually build the repair up to the level of the finish, say at least six coats. Make sure the first coat is wetting the wood and getting under the existing finish by brushing it well in. Let it dry well between coats and I would cover it against dust in some manner. When you get there, gently sand it level with wet (water) black waterproof sand paper, 1000 grit: keep it wet! Then polish with a furniture or guitar polish. Your repair should be smooth enough if you build it up slowly that you won't have to level too much, merely polish it into the finish. the edges of the chip will still likely be visible close up, but a few feet away, look OK.
