The website I saw said it had a 408% range with a 0.527 low to a 2.153 high.
Your 11-50 is a 455% range so you would have to get by with a reduced range of gears.
It would be the same as an 11-45.
So a 36t chainring to a 24t hub sprocket on the Alfine hub would be the same gearing range as a 36 chainring and 11-45 cassette.