How do I update the data member of a specific object among multiple objects created as literal objects?

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Javascript

I want to update a specific object member via an event.
An object with a canvas is created and that object has a text member that will be drawn on the canvas. Each object contains html that fires an event called call_text.
I want to update the text member of each object through the call_text event.
But the code below doesn't work the way I want it to.
The point is that updating the text member via the call_text event is reflected in all object members, not the event object.
I would like to know how to solve this problem.

Thanks for reading.
Sorry for my english.

What I have tried:

// module object
var ele_canvas = function(){
   var subtext;

   return {
      setText: function( text ){
         subtext = text;
      },
      display: function( args ){
          html = "<div id='canvasWrapper"+args.id+"' class='canvaswrapper'><canvas ><canvas id='canvas"+args.id+"'></canvas><a href='#' class='call_text' data-root='"+args.id+"' data-target='"+args.target+"' >choose</a></div>";
          return html;
      }
   }
}

var theCanvas;
$(document).on('click', '.view-canvas', function(){
/* One or more multiple objects are created through this event. */
    const args = {        
        'id': $(this).attr('data-id'),
        'type': $(this).attr('data-type');
    }
    var theCanvas = Object.create(ele_canvas());
    $('#dataFeed').append(theCanvas.display(args));
}

$(document).on('click', '.call_text', function(){
    const id = $(this).attr('data-root');
    const target = $(this).attr('data-target');

    $.ajax({
         url: "http://localhost/html/subtext/view_text.php",
         type: "GET",
         data: { data: id },
         success: function ( json ){
            const result = JSON.parse(json);
            console.log(typeof(result));
            /* here Problem */
            theCanvas.setText(result.subText);
            drawScreen(target, true); // drawing text on canvas of theCanvas Object.
         }
    });
    return false;
});