Kind of. It's only supported via an embedded Lambda code block written in a version of NodeJS that will expire in about two months.
Also, please exercise caution with your targets file. We have had a few customers complain that it's easy to mix up your targets list with a customer database dump in S3, in which case it will alphabetically and systematically begin killing them off. This is particularly bad as there's a delay before each transaction hits the AWS billing API, which may result in unusually high costs for the month and/or delays until your bill warning alerts fire.
