Call action when cursor hovers over dialogue option

(Is "hovers over" even possible? I want to believe.)

I was wondering whether it would be possible, during a dialogue, to have an action set when a text option is highlighted.
Basically, I have an object underneath the dialogue area that I'd like to change, based on which answer the cursor is over. I suppose there's some hidden event listener, because the text itself changes when the cursor is hovering (from font dialogue passive to font dialogue active).
Thanks!

Hi! Very interested about this.

not possible to my knowledge. The textarea for the standard dialog system is one whole polygon and no "per line" recognition which can be handled via lua or the action parts.

What a pity