Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
You need to contact CBC and ask for one. Roku does not create channels for 3rd party providers. CBC would have sole control over what content they make available on any app developed for a Roku device. Since I'm not in Canada, I can't see if there's a channel available from them. I only see channels available in the US. The only two channels with CBC in the name that I see are faith based organizations.
Roku Community Streaming Expert
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It will probably take many people complaining loudly. I am with you. My wife is in long term care and she would be extremely happy to be able to get CBC Gem on her brand new smart tv. If only for Heartland.