As we have a 2 week sprint cadence it's important to add the sprint number and add features to it. This means in practice that our Product Owners usually also know which weeks (e.g. 17 and 18 of 2018) a sprint is occurring. So an extra view in the calendar dropdown would suffice to make the reporting easier.
Also, as a retailer, ability to display fiscal week numbers to roadmap would be great.