How to change variable text after click in listener?

Question

Angular

Hello! I am using anyChart to plot a Gantt chart. I am trying to change the title text when clicking on a row element. But it didn't. I added a default variable with a value of 123. And then when I click a row element, the text should be changed to 567567. Maybe Angular doesn't allow you to assign a value to a variable inside a listener. Maybe I don't know something.
Here is an example with a problem. There you need to click on the element to change 123. The click itself catches chart.listen