We can't use bot events to get the channel creator, nor use MS Graph to subscribe to these events, as this question
I found some info showed in "General" Channel, like channelInfo
I also tried the graph API, GET https://graph.microsoft.com/beta/teams/{group-id-for-teams}/channels/{channel-id}/messages
,
but it is not channel message at all.
Is it possible to fetch it, then analyze it to get the expected info?