There are at least 2 ways to do this:
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Pair the plug with the SmartLife (SL) or Tuya apps. Open the device in SL and click on edit (pencil) in upper right corner. It should list 3rd party integrations. It will probably list Alexa and Google. If you are really lucky it might list Smartthings (ST).
Assuming ST is not listed create two tap-to-run automations (scenes) in SL. One to turn the plug on and one to turn the plug off.
After you do that go to ST and click + sign, add device, by brand, Tuya, other and run the integration. The 2 scenes you created in SL should show up in no room assigned.
Create a virtual switch and use that switch to create 2 ST automations. One to toggle the “on” scene and one to toggle the “off” scene.
The imported scenes will probably be listed as off line. If so go to the ST web portal (my.smartthings.com) and operate each scene. This will wake them up and only needs to be done once. -
Use Alexa. Create a Simulated Alexa Switch (SAS) in ST. Then go to Alexa and use the SAS to trigger and on routine and an off routine.
The 1st option is more reliable and does not depend on Alexa.
If you are in the US you can easily create a virtual switch for option 1 in ST Labs under the menu tab.
If you have questions let us know and we will try to help.