The built-in Shelly Wi-Fi Integration app allows you to add compatible Shelly Wi-Fi devices to your hub. This integration requires hub model C-8 Pro.

Please note that this integration is currently in beta. If you continue to have problems, please visit https://community.hubitat.com for discussion.
You may also see a suggestion to add the Shelly Wi-Fi Integration app on the home page if compatible devices are detected in range of the hub. Adding the app either way will produce the same results.
The main page of the app will list discovered devices and add them to your hub if selected. Follow the prompts in the app.