chromium/chrome/test/data/extensions/api_test/settings_overrides/homepage/manifest.json

{
  "name": "Home Page Overrider",
  "version": "2.1",
  "manifest_version": 2,
  "description": "Overrides your home page",
  "chrome_settings_overrides": {
    "homepage": "https://example.com"
  }
}