Too many messages from assignments in channel "General"

Hello

We are using Teams in a highschool: one class has many teachers. For each class, there is one team. And each teacher has his own channel in each team. I.e, the biology teacher has a channel "Biology" for his classes "3xy", "4cd", ... The trouble we are having is that for each assignment a new message is created in the channel "General" and so each teacher will see these new messages for all assignements of all classes by all other teachers. That's a lot.
For another school, I have seen the assignement creation messages being sent through the chat, only to the students. But how can I make this happen?
Thank you for any help!