At this point the integrations are the responsibility of the device manufacturer, not smartthings, so you would need to talk to them.
There have been reports from other community members of tuya integrations which only worked with some devices. Apparently if you open the manufacturer app and look at the edit page for the device details you can see which integrations are available, and if smartthings is not listed, then the device is not exposed to the integration.
Some people have been able to get some integration by putting the device into a scene in the Tuya app and then sometimes that scene will show up in the smartthings app through the integration, but it’s not full control.
See the following thread for more discussion: