Add visual on top of bar chart

[korneliuscode]

I want to add a visual (e.g. a label, vertical line, or a symbol) on top of a bar charts bar.
I can add visuals, but positioning them center to a bar (or 2 bars if there are several series) is not possible out of the box.
Also I would love to position the label/symbol in relation to the bars (e.g. where data labels "top" would be placed) dynamically.
Right now, I can match the index of the bar and select a Y position based on the value (I have to figure that out for each point), but I cannot center the visual, because Translate is absolute.

My ultimate goal is to add a visual indicator that is ideally clickable or has its own tooltip to show some comments/annotations to a particular bar/point.

Is there any suggestion for this?