chromium/chrome/test/data/extensions/unpacked/symlinks_allowed/manifest.json

{
  "name": "Test for symlinked content in unpacked extension",
  "description": "This is an extension used to test that file symlinks are allowed within unpacked extensions",
  "version": "1",
  "manifest_version": 3,
  "browser_action": {
    "default_icon": "icon.png"
  }
}