How to include Gherkin *.feature Files as conceptual Documents in DocFx Build?

**Operating System**: `Windows`
**DocFX Version Used**: 2.58.0.0
**Template used**: `default`
**Steps to Reproduce**:

Sorry if this is a silly question but docfx is quite complex and I didn't find an answer in the documentation.
My goal is to render Documentation from the Markdown in *.feature Gherkin Files.
This is what I doc:
1. check out https://github.com/docascode/docfx-seed
2. Add any Gherkin/SpecFlow *.feature File to the docfx-seed\articles Folder
3. Add a reference to this new File to the toc.md File
4. Modify docfx.json to include *.feature Files:
"files": [ "articles/**/*.md", "articles/**/*.feature", "*.md", "*.feature", "toc.yml", "restapi/**" ]
5. Generate the documentation using docfx

**Expected Behavior**:
Every *.feature File is converted into a *.html File

**Actual Behavior**:
The Links in the TOC File are generated, but no *.html File