Heres an alexa hack
Install node-red-contrib-alexa-remote2.
Go to amazon set up a blueprint skill question and answer.
Add a question for each channel. "channel one" and answer ok.
Then in alexa remote2 you can listen for the spoken words using event node, the spoken words should be msg.payload.description.summury.
The blueprint is so alexa does not respond i don't know that one.
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