Using @index within [ ] tag

[BrewDawg]

This would be great if Handlebars would allow you to use the @index within the [ ] syntax instead of a hard coded literal, for example

{{#each NavigationProperties}}
    {{StorageModels.Schema.AssociationsEnds.[@index].Role}}
{{/each}}

Notice how I would like to use the @index value, couldn't Handlebars look at the value passed into [ ] and if it's @index take it's value? This would be very useful ...

[kpdecker]

This is tracked under #569 with a work around for the existing codebase.