Pass javascript array to shortcode

I try to pass a javascript array to a shortcode, but it seems to be sanitized/escaped. For example this character "[" generate that "`{`". What is the function to retrieve original data ?

Here is a shortcode example :

[shortcode jsarray="[{start:"19:30",end:"21:00",color:'#d99694'},{start:"20:00",end: "21:30",color:'#d99694'},],"]
Some text
[/shortcode]

Here is my shortcode render function :

public function render_html($atts,$content)
{
    $atts = shortcode_atts(array('jsarray' =>''), $atts);

    $jsarray=$atts['jsarray'];
    if(empty($jsarray))
    {
        return;
    }

    ob_start(); ?>
        <div  data="<?php echo base64_encode($jsarray) ?>">
           <?php echo $content; ?>
        </div>
    <?php
    return ob_get_clean();
}

EDIT : Here is the result in shortcode_atts function :

`{`{``start``:``19:30``, ``end``:``21:00``, ``color``:``#d99694``}, {``start``:``19:30``, ``end``:``21:00``, ``color``:``#d99694``}`}`