Can we return additional information for users on completion with CompletionItem?

Debug adapter can know detailed information of complemented text. For example: On Ruby, if the given text is 1.time, then it returns 1.times because DAP can know 1 is Integer and it has the method Integer#times. On this case, with the completion results 1.times, showing Integer#times is informative for users. In other words, showing type information seems useful.

If the type information is short, it is enough by containing the information in label, but it's better to show them separately.