Hyperlink KPI Widget

Instead of JTD in combination with BloX, you could also try the OpenURL action with a URL to the dashboard you want to open. You can even set filters on the dashboard to be opened with the filter JAQL and pass values from the widget panes in the BloX widget into the filterJAQL/Url. 

This might be a sample blox script (minus the styling block).  I'm not opening a dashboard here but it does demonstrate the principle of passing a value into the url:

{
    "style": "",
    "script": "",
    "title": "",
    "showCarousel": true,
    "body": [
        {
            "spacing": "medium",
            "type": "Container",
            "items": [
                {
                    "spacing": "small",
                    "type": "TextBlock",
                    "text": "{panel:GroupBy} ",
                    "color": "default",
                    "horizontalAlignment": "center"
                },
                {
                    "type": "TextBlock",
                    "text": "{panel:Aggregation}",
                    "horizontalAlignment": "center",
                    "size": "extraLarge",
                    "style": {
                        "color": "#117899"
                    }
                },
                {
                    "spacing": "small",
                    "type": "TextBlock",
                    "text": "<span class='blox-sparkline' type='line' line-color='#117899' width='200' height='50' line-width='3' fill-color='#B2D4DF' point-color:'#117899'>{panel:Aggregation}</span>",
                    "horizontalAlignment": "center",
                    "size": "medium",
                    "weight": "bold",
                    "color": "grey"
                }
            ]
        }
    ],
    "actions": [
        {
            "type": "Action.OpenUrl",
            "title": "Open In Web",
            "url": "https://www.sisense.com/sisense-labs/?test={panel:GroupBy}"
        }
    ]
}

This has its own limitations but it could be worth experimenting.