Is it possible to use sass when working with WebC in bundler mode?

[MartyNZ]

If so, is there some documentation covering the implementation?

[djwebdroid]

Eleventy webc uses the eleventy-plugin-bundle under the hood. So you would add your sass as a transform in your eleventy config: https://github.com/11ty/eleventy-plugin-bundle/#use-with-webc

The example on that link uses postcss. But it will give you a general idea on how to proceed.

Hope this helps