The first thing I would do is apply some cutting polish to the area to see how much of the scratching polishes out.
You can then decide whether to pay for a smart-repair or just touch up. IMO smart repairs never look right with metallic - you cannot sand the metallic (the flakes will pull) and then the lacquer needs to go on top (and that will not blend very well on a small localised area). Hence the reason why most metallic repairs involve lacquering the whole panel.
The damage looks relatively small so I would touch up. But gravity and cold weather are your enemies. Any paint you apply will want to run (gravity) and the cold will make the paint thick. So warming the paint in the house can help (thinning the paint so it flows into the damage better). Further, touch-ups work best on very small areas (stone chips about the circumference of the supplied brush) once you get past that (like damage on the right of your picture) multiple dabs will be needed and the finish can start to look lumpy. But whatever you do, do not attempt to brush the touch up on, that will look terrible, just dip something like a toothpick in the paint and lightly touch the area with the tip of the pick to allow a small amount of paint to flow off the tip into the recess (and repeat).
If you apply too much (or you are not happy with the finish) just wipe the area off and try again, the paint will not dry that fast so you can keep trying until you get a finish that is not as noticeable. I would try to keep the metallic below the finish level of the paint because you have to apply lacquer afterwards. In theory, the lacquer could be sanded with a very fine wet and dry and a sanding block (but you would have to be mindful of the edge of the wheel arch because you could easily burn through and cause more damage) and then polished up. Or you can just apply the lacquer and leave as is. Alternatively, you could apply the lacquer (only to the chips) with something like a tiny sponge applicator on a paint brush (rather than a toothpick) (again dabbing not brushing) and just leave as is.
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