too long

I am developing Alexa app and everything working great now. but for a change i want to change few text with icons. For ex: Address heading should be change with a location icon and so on.

$message.='Event Name:   '.$ename.'
Location:   '.$vname.'
Address: '.$fullAddress.'
When:   '.$ondate.''.$time.$cardMessage;

and card will be displayed like this:

$card = '"card": {
              "type": "Standard",
              "title": "Play Audio",
              "text": "'.$message.'",
              "image": {
            "smallImageUrl": "'.$ArtistImage.'"
           }
        }';

because it is full text which is shown on app card, I am not sure how to place an icon for it. Please help.

Make sure to provide a full URL in your $ArtistImage.