Yes, but even the intrepid breeder would need to have fish with the trait(s) from the beginning...somewhere to start from...the production of more fish is actually the easy part (I understand genetics too, but as Oama will say, clownfish don't always follow the rules
If selecting for the trait means buying a pair, then that can be done too, but it will take time, and I don't believe they've been available long enough to have produced offspring.