Utilizing Space under Legends for Additional Information

Have you ever struggled for little space for placing information and Just observed -"Hey! I have some under Legends!". But, That area is not available for editing
What to do ?
Well, Remember I have shared a post about adding Information to Menu bar ? I have customized that to add some extra stuffs. We will create a button on Menu bar, which will bring some extra information under selected legend (eq(2)in code is 3rd legend item of the page here).

Add this code to a JavaScript -
if(!$('#AlienBox').length){
$('body').append($(`<style id="AlienBox">
#Brand {
    position: absolute;
    top: 0px;
    right: 40%;
    height: 30px;
    width: 150px;
    z-index: 99;
border: 1px solid chocolate;
border-radius :5px;
color:chocolate;
}

</style>`, {
        id: 'AlienBox' 
   }));
}

if(!$('#Brand').length){
$('body').append($(`<div id="Brand">
<center> For Information  <br> <button onclick="alienLegendFn()" style="background-color: chocolate;border: none;  color: white;   text-decoration: none;  display: inline-block; ">Click Here</button> </center>
<script >
  function alienLegendFn() {
  if(!$('#AlienLegend').length){
$('.sf-element-legend-item:eq(2)').append($('<div id="AlienLegend" style = "border: 1px solid chocolate; border-radius :5px; color:chocolate;"> You can place addional information here </div>', {
        id: 'AlienLegend' 
   }));
}

   </script>
</div>
`, {
        id: 'Brand' 
   }));  
}

Here is what you expect after clicking newly created button -
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