Get model metadata from engine.js

I am using the engine part of kiri:moto
await slicer.slice();
await slicer.prepare();
const gcode = await slicer.export();

Is there a way I can get access to internal meta-data of the sliced model?
Most important for me is the actual numbers of walls/shells e.g. user iput is 4 walls but model is too shallow and uses 2 walls. Or minimal / mean width of model to determine number of walls possible.

But also other meta information which I don’t have to reinvent from gcode analysis like material used, print time, support used, etc etc