Of course I’ll give you an example.
Unfortunately all Fibaro devices don’t have a temperature association group, so you can’t do it “the zwave way” with associations.
Lucky, with the openhab and the spirit there is the other way. You link both the channel of the spirit and the channel of the temperature of your Fibaro device to one item.
Example:
Number Bathroom_Radiator_SensorReport "Badkamer externe temperatuur [%.1f °C]" { channel="zwave:device:512:nodeYY:sensor_report,zwave:device:512:nodeXX:sensor_temperature" }
Where nodeYY is your spirit device and nodeXX is your Fibaro device.