If you are using the app Fully Kiosk Browser, it has a built-in REST API that can be called from SmartThings or Hubitat. I was originally recommending people do this by creating a Virtual HTTP Switch using code from the ST community and then have it call the relevant Fully Kiosk API:
//use the screensaver features on Amazon Devices to avoid ads on the lockscreen
/?cmd=startScreensaver&password=[pass]
/?cmd=stopScreensaver&password=[pass]
//you can use the screen on/off features on regular Android devices if you like to keep your screen off
/?cmd=screenOn&password=[pass]
/?cmd=screenOff&password=[pass]
There’s now a community developed Fully Kiosk Browser integration for SmartThings and Hubitat that some people prefer:
Personally, I still think the Virtual HTTP Switch approach is simple enough for most use cases and the beauty of it is that because the device is exposed as a switch, it’s easy to use anywhere (eg. dashboards, rules/automations, etc).