is there anyway to implement timer to choicePanel? something like this.
if timer is up, we can do some simple logic.

It's possible, just add @wait instead of @stop and hide the choice handler when the time passes, eg

Decide in 5 seconds.
@choice 1
@choice 2
@wait 5
@clearChoice

Here is another example in the docs: https://naninovel.com/api/#clearchoice