We could see in the Wargroove campaign all the time how Emeric was looming over us in a skirmish and commenting on how we should move our units. How do I do the same thing in my custom campaign?
You misunderstood me. I'm not interested in creating any more cutscenes, more like actually having conversations on the battlefield. You remember how Sigrid talk with us at the first prologue when she kill guards? Like that. Not scenes in a timeline but conversation bubbles on the actual battlefield.
There is a trigger action called "UI: Show Dialogue Box". That'll display conversation messages outside cutscenes. These are the included fields.