If your cameras are in the Smart Home supported model list, but you can not find the cameras in the Smart Home section, then you need to upgrade the firmware for the camera.

Applies to: Compatibility with Google Home & Alexa.

You can refer to this article to upgrade your camera to the latest firmware: How to Upgrade the Firmware for Reolink Products.

These two articles show how to add cameras to Smart Home:  

How to Add Reolink Cameras to Amazon Alexa

How to Add Reolink Cameras to Google Home