I'll add your suggestion along with the release of the next version of the battle core.
Viewing post in Multi Wave Battle plugin - RPG Maker MZ comments
Thank you, love your work! also I did remember chain battles from old pokemon games, and would be cool if we can (easier and optionally) let each enemy say something on appearing, say something at random from their notes from a list of the troop, example Big Slime: "I am hungry and you look tasty", "I'll kill yo before you blink twice!", etc.
Also an optional message as narrator: "This creature seems to be a feared boss in this dungeon!" etc,
It would be a super interesting! Making it much easier to make our chain battles to be very atmospheric and hooking.