Adding Teams editing in specific channels without allowing it in personal chats.

Hello All,

For industry compliance, we have message editing and deletion disabled for our user base within local chat messaging. We do however use Channels for company announcements, promotions, and more. We currently have these options disabled in our organization default, and would like to keep it that way, but allow users to edit/delete posts they have made to our company-wide channels. Our problem is that the global default is overriding the permissions we have set on our channels for users to edit/delete messages. Has anyone successfully setup a policy for editing/deleting messages ONLY on posts made in channels, without the policy changing the rules for chats amongst employees?