If this is SPEM-003CEBEU it’s supported in the current add-on. However support was likely added after wear ever version of OH 3 you are running was released. Based on the docs it looks like OH 4.0 was when it was added.
To get native support in the binding you’ll have to upgrade OH to at least 4.0. Or I believe many Shelly devices support MQTT. You can see if this one does and integrate that way. It’ll be more work if course but not a whole lot more.
If it’s not in the supported devices at all you need to see if the device supports MQTT. If not, wait for support to be added to the binding and upgrade after that.