This is a Streamsheets Enterprise feature.
Lists all channels within a Slack workspace. This functions takes an optional JSON parameter to define more advanced settings and additional options. Please refer to https://api.slack.com/methods/conversations.list for more information about available and supported options (as of 2021-05-17).
=SLACK.CHANNEL.LIST(Token, [ResponseTarget], [OptionsJSON])
|Token||A token which is registered to a workspace and has required access rights|
|ResponseTarget (optional)||Specify inbox, outbox, cell or cell-range to write any response to|
|OptionsJSON (optional)||A JSON which contains additional options|
|Requests all available channels and sends server response to inbox|
|Same as before but limits channels in response|