Thats correct, Vimeo is a great video platform, but it's very limited when it comes to creating content feeds for Roku.
Our OTTfeed.com platform was built to bridge the gap between content and Roku Direct Publisher.
For more info go https://ottfeed.com.
Cheers
OTTfeed: Lease a custom Roku SDK for $99/month go to https://OTTfeed.com/lease