template.json

{
   "type":"message",
   "attachments":[
      {
         "contentType":"application/vnd.microsoft.card.adaptive",
         "contentUrl":null,
         "content":{

    "type": "AdaptiveCard",
    "body": [
        {
            "type": "TextBlock",
            "size": "medium",
            "weight": "bolder",
            "text": "TITLE",
            "wrap": true,
            "color": "accent"
        },
        {
            "type": "ColumnSet",
            "columns": [
                {
                    "type": "Column",
                    "items": [
                        {
                            "type": "Image",
                            "style": "Person",
                            "url": "https://www.example.com",
                            "altText": "me",
                            "size": "Small"
                        }
                    ],
                    "width": "auto"
                },
                {
                    "type": "Column",
                    "items": [
                        {
                            "type": "TextBlock",
                            "weight": "Bolder",
                            "text": "Top LEvel",
                            "wrap": true
                        },
                        {
                            "type": "TextBlock",
                            "spacing": "None",
                            "text": "Created today",
                            "isSubtle": true,
                            "wrap": true
                        }
                    ],
                    "width": "stretch"
                }
            ]
        },
        {
            "type": "TextBlock",
            "text": "my big descritpion",
            "wrap": true
        }
    ],
    "actions": [
        {
            "type": "Action.ShowCard",
            "title": "Set due date",
            "card": {
                "type": "AdaptiveCard",
                "version": "1",
                "body": [
                    {
                        "type": "Input.Date",
                        "id": "dueDate"
                    },
                    {
                        "type": "Input.Text",
                        "id": "comment",
                        "placeholder": "Add a comment",
                        "isMultiline": true
                    }
                ],
                "actions": [
                    {
                        "type": "Action.Submit",
                        "title": "OK"
                    }
                ],
                "$schema": "http://adaptivecards.io/schemas/adaptive-card.json"
            }
        },
        {
            "type": "Action.OpenUrl",
            "title": "Action.OpenUrl",
            "url": "https://www.example.com"
        }
    ],
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.3"
}

      }
   ]
}