{"NAME":"Teckin SS31","GPIO":[255,255,255,255,56,57,255,255,21,17,22,255,255],"FLAG":15,"BASE":18}

Tuya-Convert might not be possible for this device if the manufacturer started using newest Tuya firmware since this template was published. Instead you can likely serial flash Tasmota without soldering with a flashing jig, if the device is easily opened.

Only one button on the device, to access Relay2 via a button you would need to use a rule to toggle the relay.