Create visual composer extra class to display amount sold as percentage

Need to create a visual composer class to be placed on the extra class field ox an empty text box on the grid builder. This grid builder template is to display woocommerce products. The class will check the initial amount available of the product, the current amount sold (based on sales) and will display the amount sold in a filling out circle representing the percentage sold (example 360 initially, sold 180, then sold is 50% in this case). See attached image of circle for 50% example. Must be able to place the color code in the class to select the color to display circle in and color to display filling out (thicker) sold part. Must be able to set the circle size (pixels) and the percentage size (the filling out part, in pixels). In the example the same color is used for general circle and for filling out part