Is there any way or a good solution to define custom icons and colors in callouts themselves? And with little or no CSS?

I see you posted a feature request for this without waiting long for input on this help request. (Allow defining custom icons and colors directly on the callouts themselves and without CSS). I was going to close this thread so discussion can happen in one place, but you didn’t follow the feature request template on the other one. Do you want to fix the feature request and close this thread, or close the feature request and keep this thread?