Filter Slack notifications based on whether the idea is from an employee or a customer

We currently use the Slack integration to keep track on New ideas, Votes and Comments but it would be really helpful if we could filter the channel to only show customer ideas. This would make it easier to focus our attention on customer requests and activity.

We currently use two different portals going to the same product, so filtering by portal could be an option or adding the ability to filter on the visibility field, or by the employee domain identifier.