If you’re working creating importers or exporters for SketchUp then you’ll want to work with the SketchUp SDK. This is where you can discuss issues or ask questions about the process.
To get started with the SDK you’ll need to sign the Terms of Service and download the kit here: Homepage | SketchUp Developer
For bug reports and feature requests, please use the issue tracker on GitHub: Issues · SketchUp/api-issue-tracker · GitHub