I understand that creating workouts is best left to a computer. But it would be nice if pre-made ones could be downloaded & imported via an iPad for workouts. Not everyone has a computer!
This would be possible if you combine it with my feature request.
https://support.zwift.com/hc/en-us/community/posts/360011116312-iOS-Store-Workouts-in-iCloud-Drive
You could then download the workout on your iPad into your iCloud Drive, which would then automatically appear in Zwift.