Hello @rishiichaudharyy,
You can do that with some custom CSS.
All you have to do is to add a different icon font and apply it to this selector [class*="add_to_cart_button"].loading:after
, it should be something like this:
[class*="add_to_cart_button"].loading:after {
font-family: 'your-icon-font' !important;
content: 'icon-font-icon' !important;
}
Here you can find more info about icon fonts – https://webdesignerwall.com/tutorials/how-to-add-icon-fonts-to-any-element-with-css
Hope this helps.