One of the very few good things from the AI race has been everyone finally publishing more data APIs out in the open, and making their tools usable via CLIs (or extensible APIs).
They aren't doing that though. At least not yet. It's generated from the discovery tool, which amounts to the spec of the existing API. If they want a high powered CLI they need to dig into the servers behind Google Workspace like they have when they've improved the web apps.