See updates from primary view

When a user adds a message to a list, I want to be able to see which list was updated. Is there a way for an icon to appear when that list has a new message that I have not seen?

Unfortunately, no. You can, however, use an expression to set the view’s display name, which you could use to include an unread count, or an emoji indicator.

That would work quite well. What would the expression look like?