How to group by content to IList property in CMS

Hi,

I have a requirement of grouping the content in IList propery in CMS. Below is my property example.

[Display(
Name = "General questions",
GroupName = SystemTabNames.Content,
Order = 130)]
[CultureSpecific]
public virtual IList<ContentReference> GeneralQuestions { get; set; }

So here, Editor can drag and drop all the content references but i need to have one more option of grouping content references with name.

It's kind of Visitor group format. But i dont want to use this as it's only text group format.