Support intermediary transformation for object

Currently writing a collection of files following a similar structure to the one below:

critical-chance = 70
critical-damage = 100
damage = 20
range = 40

I'd like for double-barrelled names to be converted to camelCase automatically, i.e. critical-chance to be mapped to criticalChance. I think the cleanest way to do this would be for the loader to support a transformer function that controls the object's shape such that it is able to match the passed in schema.