Play: Automating test data setup

I have a playframework project that has reached beta/user testing. For this testing we require test data to exist in the environment I am looking for a way to automate this via scripts. The best way will be via call's to the API passing the correctly shaped data based on the models in the project (thus dependant on the project not external). Are there any existing SBT plugins that I could utilise that would be able to create the appropriate JSON and pass it to the API to setup the environment