Switch in Hassio to control Google Assistant devices

Fairly new to Hassio, I have the system working and Google assistant relay setup, I can execute commands via the webUI with no problem. I am struggling to find a guide to create a “switch” to execute commands to the Google Assistant relay. I have looked into using restful commands with no luck some assistance or a guide would be helpful. Example I want to control a Hassio non compatible output device from Hassio through google assistant. and if possible get feedback on the status