Deploying a bot created in Copilot Studio to Windows Copilot involves a few steps. While you can't add it as a plugin in the same way as Kayak and Instacart, there are other solutions to achieve this.
- Copilot Studio: You can use Copilot Studio to create, test, and deploy conversational copilot. It includes advanced capabilities of the Azure Copilot Framework and allows you to deploy copilot securely using central administration, built-in security roles, and simple management across environments to maintain compliance and governance
- Export and Import Copilots: You can export copilot from one environment and import them into another using solutions. This method acts as a "carrier" for the copilot, allowing you to export and import multiple copilots in one solution
Please find below link to publish and deploy your copilot.