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Thanks Michael for your hint regarding metadata and REST API : openHAB Google Assistant Integration v2.0

Unfortunately it doesn’t work.
I have tried:

{“name”:“nikohomecontrol_blind_440e003a2369_35_rollershutter”,
“tags”:[Blinds],
“type”:“Rollershutter”,
“link”:“http://x.x.x.x:8080/rest/items/nikohomecontrol_blind_440e003a2369_35_rollershutter",“state”:“1”,“editable”:false,“label”:"kitchen window”,“category”:“Blinds”,“groupNames”:[],
“metadata”: {
“ga”: {
“value”: “Blinds”,
“config”: {
“roomHint”: “Kitchen”
}
}
}
}

the response is ok (200) and:

[
  {
    "name": "nikohomecontrol_blind_440e003a2369_35_rollershutter",
    "status": "updated"
  }
]

When getting the items and specifying the metadata ga ()

curl -X GET --header “Accept: application/json” “https://x.x.x.x:8443/rest/items?type=Rollershutter&metadata=ga” -k

I got no metadata:

[
  {
    "link": "https://x.x.x.x:8443/rest/items/nikohomecontrol_blind_440e003a2369_35_rollershutter",
    "state": "0",
    "editable": true,
    "type": "Rollershutter",
    "name": "nikohomecontrol_blind_440e003a2369_35_rollershutter",
    "label": "kitchen window",
    "category": "Blinds",
    "tags": [
      "Blinds"
    ],
    "groupNames": []
  },
  {
    "link": "https://x.x.x.x:8443/rest/items/nikohomecontrol_blind_440e003a2369_38_rollershutter",
    "state": "1",
    "editable": true,

I have switched simple link off.
Any hint plz?
Thanks.