To add on to what @joshua was saying, we are pretty careful about what we make available in our lambda because performance is really important and we don't want to start loading a bunch of data that isn't required. That said, I understand the current lambda implementation isn't meeting your needs, however.
Two issues you may want to review, comment on and vote up:
https://github.com/FusionAuth/fusionauth-issues/issues/229
https://github.com/fusionauth/fusionauth-issues/issues/267
Both of these issues address your desired functionality in different ways.