How to print the mean value of reversals after staircase experiment using the Builder

OS: Win 10
PsychoPy version: 2022.1.3

What are you trying to achieve?: I designed a staircase experiment with 3 reversals and would like to print / display the mean values of the 3 reversal points as result to the participant.

What did you try to make it work?:
I tried to implement it using a code and a text element like in Tutorial 2 (Measuring a JND using a staircase procedure). But as the tutorial only shows the code (lines 99-116) and does not explain how to realize it with the builder, I was unable to correctly apply it in my experiment.

What specifically went wrong when you tried that?:
When I run the experiment, the window, in which the result shall be displayed, and the defined text also appear. But the caluculated meanvalue is not shown at all.