Generating figures with tectonic-as-a-library

[ratmice]

I'm generating a bunch of figures from custom rust code, given that it seemed like it would be nice if there was a more direct route than just
writing the images to the filesystem and having tectonic read them.

The first thought that occurred to me is deriving the Bundle trait to hold the generated images,
ProcessingSessionBuilder

Anyhow, was curious if there was an intended workflow for how this kind of thing should be done ideally, and if I was on the right track.
I suppose this may be a rabbit hole, and I'm not so sure it itches bad enough to scratch at the moment, but thought I would ask.