String list property with auto-suggestions

As a developer, I would like to add a list of strings to an Episerver page. Each string has to have auto-suggestion enabled in the editor interface, so that an editor can select an option from the list instead of writing ot completely.

Ideally it would look like this:

[AutoSuggestSelection(typeof(MySelectionQuery))]
public virtual ICollection<string> ListOfStrings { get; set; }

This piece of property code compiles fine. But when rendering the property in All-Properties View, it looks like a single-string property with autosuggest. When I select something and click outside the field, an error pops up (because a single value cannot be casted to the list of strings).

I would like to see see string list property as rendered here.