CBD-A and THC-A in Organic olive oil, how to decarb?

Hey everyone, i have a few questions regarding some oils that i can get my hands on. So the products i can purchase are THC-A in organic olive oil and CBD-A in organic olive oil. Now i live in Australia, so the seller does this to bend laws i assume. The size for both is 50mls and because of laws once again it is unable to be tested for strength, so i’m unsure of dosages etc. Now im wondering, if i decarb these in a hot water bath (leave in jar with lids off in hot water) i should end up with a jar of THC in olive oil and CBD in olive oil? Do you think it would be a good idea to then add both these bottles to a brownie mix to get a nice thc and cbd edible? Would i need to decarb the oil first or could i just put it in the brownie mix because it will be getting cooked in the oven? Would something else like gummies or cookies be better? Sorry for all the questions, just trying to get my head around this. Thanks for any help i recieve :)