It might be possible when they are older, but it might not work out or be the best idea. Seeing stress in chameleons can be very difficult and might not be noticed early enough if they were housed together. We have seen some threads of animals that have become terribly ill after being housed with another chameleon, so many people advise against it. I do too unless the keeper is very experienced, knows the animals well, and has a lot of time to watch them in the beginning. Your enclosure is probably big enough, but definitely dont try it until the female is at least 1 year old/big enough to breed and you are completely confident in your husbandry and skills as a keeper/breeder.
Some people recommend against keeping them together because they think that the female might lay eggs too often. This can be true (and it is certainly a bad idea to allow a young/small female to breed) but keepers have also reported that many females actually breed less often when housed together with a male and the males are less likely to breed very aggressively or badger them to breed constantly.
If you decide to try it later on, come back and ask for tips on how to do it successfully (from people who have done it themselves preferably.)