Fields component media field using absolute url instead of relative

I think you are looking for the rawvalue property of the field object

/* Rearrange Fields for use */
foreach($this->item->jcfields as $jcfield){
    $this->item->jcFields[$jcfield->name] = $jcfield;
}

$absolute_path_to_image = JUri::base() . $this->item->jcFields['your-field-name']->rawvalue;

You would need to override the core functionality. Or simply, in your template(s) where you output your images, you could just use:

<?php echo JUri::base() . $yourimagevariable;?>

Which will generate:

https://yourdomain.com/images/yourimage.jpg