[Haskell-cafe] Can any hackage library do JWT signing

I want to enable a Haskell benchmarking bot that would upload its data to a Google Fusion Table each time it runs. That seems to require the "service-to-service" mode for Google's OAuth2: https://developers.google.com/accounts/docs/OAuth2ServiceAccount There are a bunch of libraries on Hackage for different flavors of OAuth. But I haven't yet found one that handles this signing of JWT headers and claimsets. Is there something I'm missing? Thanks, -Ryan