Bubble opacirty

Trying to set a different opacity to the first bubble

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://code.highcharts.com/highcharts-more.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>
<div id="container" style="height: 400px; min-width: 310px; max-width: 600px; margin: 0 auto"></div>

JavaScript

$(function () {
    $('#container').highcharts({

        chart: {
            type: 'bubble',
            zoomType: 'xy'
        },

        series: [{
            data: [{
                x: 10,
                y: 90,
                z: 79,
                color: 'rgba(47,226,216,0.5)'
                
            }, [90, 10, 60],
                [50, 50, 1]
            ]
        }]

    });

});