chromium/chrome/test/data/extensions/api_test/user_scripts/dev_mode_tests/manifest.json

{
  "name": "Test",
  "manifest_version": 3,
  "version": "0.1",
  "host_permissions": ["http://example.com/*"],
  "permissions": ["userScripts", "scripting"],
  "background": {"service_worker": "background.js"}
}