Of course the proper thing to do would be to remove, & have it rechromed/ground.
If your looking for a short term fix, I'd use a die grinder (or Dremel) to remove any burs on the chrome. Do not remove anything more than the chrome layer. Then clean with acetone. Then heat to maybe 250' or so, & apply a thin coat of JB weld. Use the slow set type, as it will be stronger than the fast set types. The heat will thin the JB to a paint like consistancy, aid the bond, & help it level. It would be benificial if the spot were in a level position so as to level better. After curing you'll need to gently shape in the JB Weld to a smoothe shape with a flat file, & then polish out with fine sand paper.
Again, I would recomend removing & having it rechromed as a first choice.
Joe