config.json customAttrs not recognized

[vfebert]

system works, however all definitions behind "customAttrs" are just ignored.

what's wrong?
here's my config.json
"platforms": [
{
"platform": "HarmonyHub",
"name": "Harmony Hub"
},
{
"platform": "openHAB",
"name": "openHAB",
"host": "192.168.178.27",
"port": "8080",
"sitemap": "raspi",
"useLabelForName": true,
"customAttrs": [
{
"itemName":"Outside Temperature",
"itemLabel":"Aussentemperatur",
"itemManufacturer": "Selfmade",
"itemModel": "NTC",
"itemSerialNumber":"12345678",
"itemType": "TemperatureSensorItem"
},
{
"itemName":"Deckenlicht",
"itemLabel":"LampeDecke",
"itemManufacturer": "Hersteller Deckenlicht Wozi",
"itemModel": "Deckenlicht im Wohnzimmer",
"itemSerialNumber":"12345678",
"itemType":"LightbulbItem"
}
]
}

]