@atc98092 The HEADING of this forum topic is "Suggest a Feature" I agree, but the DESCRIPTION of this forum topic says "Share your requests for new features, channels, etc. with the Roku team!":
Suggest a Feature
Share your requests for new features, channels, etc. with the Roku team! Search keywords and add a kudo to an existing topic to show your support, or create a new topic if your suggestion isn't listed.
Anyway, I have contacted the provider as well (in this case, BT, as it is the BT Sport App that I would like see added to Roku) and they have confirmed that it WILL be coming "very soon".
It was a contractual issue that forced them to make it available on the Roku powered NowTV devices first before making it available on the Roku devices themselves. Which seems a bit back to front, but I can understand it being part of the deal agreed with Sky 2-3 years ago whereby Sky would make their NowTV channels available to BT TV subscribers.