Add a way to acceed to loop data

when using block {{#anArray}} {{/anArray}}
You may accedd to loop datas with @index @arrayindex and @length
{{@index}} / {{@length}}
will output
1 / 12
2 / 12
3 / 12
...
@arrayindex start at 0 instead of 1

Maybe there is a better way to do this, but something is really missing on this point