Possible to repair a flat-spot (kerb hit) on rear rim?

Dear all. Just got my first Rohloff bike. I did not spot a full height
kerb drop-off on one of the local cycle lanes. The front was saved by
the NCX suspension but the rear took the full hit when going up the
kerb. This has caused an indent in the rim or 'flat spot'. In part
this is becuase the shop did not sufficiently tighten the spokes after
purchase, but mainly just unfortunate accident.

Is such a flat spot in an Mavic A319 rim repairable or do I need a
rebuilt wheel?

cheers
Jon