There are two possible options, but I don’t know if they fit your exact use case.
The IFTTT “button” service Will work as a widget on an Apple Watch. That works quite well if you only have a couple of things you want to use the watch for.
And of course there’s always Homekit. If you use homebridge to bring your smartthings devices into HomeKit, then you can use that with the Apple Watch.
Either of these methods will work with a number of different hubs, including SmartThings.
