Post a message to a specific MS Teams Channel using deep link URI

Hi, 

We are able to send a message to a team chat using 

https://teams.microsoft.com/l/chat/0/0?users=<user1>,<user2>,...&topicName=<chat name>&message=<precanned text>

But how do we do this (Post a message) to a specific Team Channel?

I tried

msteams://teams.microsoft.com/l/channel/channelid/General?groupId=groupid&tenantId=tenantid&message=hello

but it just opens the channel in MSTeams.

Any help would be greatly appreciated.

Thanks