How use Data > Data Function Properties > Expression Function > Function Type : Aggregation function

[DoYeob Kim]

In this video

https://youtu.be/0ayW9DLO70Et=323

he said that if I define some aggregation function atData > Data Function Properties > Expression Function > Function Type : Aggregation function,

then I can use the aggregation function at any plot, like bar plot (Please watch the video).

However, I can't find my function at the bar plot (y-axis).

Also, I can find my function at "Add caculated column".

Is it possible that I use my function at the bar plot directly

If it is, please answer to me how to, with an example.

Thanks to read this.