I'm not aware of any way to do that, but there is a similar option that might work. You could create a user macro that has a body (doesn't really matter which option) and which only contains the following text:
You could call this "nodisplay" or something like that. Basically the body of this macro will show in the editor, but won't be displayed on the page. There isn't any fancy formatting like Tip or Warning, but at least it will provide some of the functionality I think you're looking for.
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