Found my answer in Switch on by publishing a command and a json string, I need to use:
UID: mqtt:topic:mosquitto:Light_LivingRoomTable
label: Living Room Table Light
thingTypeUID: mqtt:topic
configuration: {}
bridgeUID: mqtt:broker:mosquitto
location: Living Room
channels:
- id: POWER
channelTypeUID: mqtt:switch
label: Power Switch
description: null
configuration:
commandTopic: cmnd/ZbBridge/ZbSend
formatBeforePublish: '{"device":"Light_LivingRoomTable","send":{"Power":"%s"}}'
stateTopic: stat/ZbBridge/RESULT
off: Off
on: On