enable annotations for grouped bar chart #6543

I can't find any way of adding annotations to individual bars in grouped bar chart.

Minimal example: https://codepen.io/bleah1/pen/vYzMRWJ

• related Annotations for grouped bar charts plotly.py#356 (textposition applies only to the text properties of each trace, annotations represent a layout property)

I am building a grouped bar chart with a slider and based on this workaround plotly/plotly.py#356 (comment) I was able to add annotations to each frame.