Clam will have to be removed and bottom area repainted.
For what is really not visible damage, you can paint it on the car and blend into the existing paint and no one would ever be able to see it even if they were looking for it.
Even at exotic and luxury car dealerships, it's not unusual if a bumper gets dinged while sitting on the lot, that it's spot repaired and blended into the area.
This is a very viable and appropriate repair for simple 2 stage paint jobs. On something like this where the repair isn't in direct sunlight I would even do it with a tri-stage paint job. Where repairs like this wouldn't be appropriate would be tri-stage paint jobs, in a highly visible area, where the paint might match in the shade, but as the sun hits it at different angles the flop might be slightly off.
Bumper shops do this type of repair typically for $150-300. The poster will pay Lotus tax and that number will go up once you pull up in your car, but still it's a relatively cheap and very easy fix.
Call the local BMW/Mercedes/Porsche dealerships etc. Ask them who they use for damaged bumpers/simple repairs. They will likely know the guy in town who's cheap and still capable.
OR you could throw on a nice GRP front splitter. THey look great, they would hide this completely and prevent it from happening again.
I just slammed my car and pulled up to a curb and crunched my front carbon lip and it sounded AWEFUL, then rolled backwards tried to put it into reverse, put it into first by accident and DID IT AGAIN. ARGHHH.
Thought my front clam was destroyed, jumped out of the car, looked at the front end and it was completely untouched, and I mean literally I can't even see anything and I know all the imperfections. They really do protect the front end!!