All channels list accessible via API

Hello,
For now, I know that I can get the list of channels (in "via" object) in this link https://developer.zendesk.com/documentation/ticketing/reference-guides/via-types/ , but I am not sure if it is up to date..
Also, I would prefer do access it by api, something like HTTP GET : .../api/v2/channels . Will it be possible ? I am a little bit amazed that such a thing isn't possible to be done (or I did not find the right doc page?). It would help to get the list programmaticaly and not by copying / pasting from your documentation. Especially when this list changes over time..

Best regards,
Tomasz