Import postman collection in SoapUI 5.7.0 raises an exception

Yes I see why it is not working now. I structured the request within folders to have a better overwiew. It seems the items are not read and a request arry is expected instead of an item array. But also if the collection is unstructured there is an item array which consists of
objects:

{
	"name": "api_key/",
		"request": {
			"auth": {
				"type": "noauth"
			},
			"method": "POST",
			"header": [],
			"body": {
				"mode": "urlencoded",
				"urlencoded": [
					{
						"key": "username",
						"value": "{{api.username}}",
						"type": "text"
					},
					{
						"key": "password",
						"value": "{{api.password}}",
						"type": "text"
					},
					{
						"key": "platform",
						"value": "{{platform}}",
						"type": "text"
					}
				]
			},
			"url": "{{protocol}}://{{base_url}}/api/api_key/"
		},
		"response": []
}

Renaming the item array also does not succeed. I guess the plugin is outdated for the new structured v2.0 & v2.1 Postman-JSON.