create_skillset.json

{
    "description": "Cluster images for labelling",
    "skills": [
        {
            "@odata.type": "#Microsoft.Skills.Custom.WebApiSkill",
            "description": "A custom skill that can cluster and auto label images",
            "uri": "https://[yourwebapp]/api/extraction",
            "timeout": "PT160S",
            "batchSize": 1,
            "context": "/document/normalized_images/*",
            "httpHeaders": {
                "Ocp-Apim-Subscription-Key": "OneWeek"
            },
            "httpMethod": "POST",
            "inputs": [
			    {
			        "name": "images",
			        "source": "/document/normalized_images/*"
			    }
            ],
            "outputs": [
                {
                    "name": "label"
                }
            ]
        }
    ],
    "cognitiveServices": {
        "@odata.type": "#Microsoft.Azure.Search.CognitiveServicesByKey",
        "description": "cogsvc",
        "key": ""
    }
}