Prevent ‘reply all’ in Facebook group message

I’m the admin for a Facebook group of approximately 50 members, and I want to send a single message to everyone in the group. I need to use a message because most members of the group do not receive notifications for posts on the group page.

The last time I sent a message to the whole group, a few members started replying in a casual chatty way that spammed all of the other members and led to some of them leaving the group.

Is it possible to send a message to a group that does not allow anyone to “reply all”?