2👍
Your annotation is at y value:5 which is right at the bottom of your chart.
Here’s a codepen with the annotation working.
I’ve assumed your labels looks something like this:
labels: [6,7,8,9,10,11],
and your data
data: [38, 8, 32, 25, 47,30],
and then made the annotation value:
value: 30,
Source:stackexchange.com