Notifications: Need filter for repos by owner/organization

According to https://docs.github.com/en/free-pro-team@latest/github/managing-subscriptions-and-notifications-on-github/managing-notifications-from-your-inbox#custom-filter-limitations, there is no filter such as repo:username/, or owner:username, or user:username, etc.

All I want is to be able to filter notifications by whether they are on repos that I own. I need to do this so I can see notifications for repos that I am responsible for.

The existing filters, such as reason:assign or reason:participating, do not cover this case, because, e.g. issues posted on my repos are not already assigned to me, and I have not already commented on them.

Why isn’t this simple use case supported?