Aviator Chrome Extension
Click the login button, and you'll redirected to the Aviator login page. If you are already logged in, it should automatically get back to the original PR page.
If the repository is configured with Aviator MergeQueue, it shows a button to enqueue a pull request.
If you need, there is an option to show the original GitHub merge button.
You can open the extension option page from the extension menu.
You can specify your on-prem Aviator deployment URL.