Interactive Data Labels - In Graph & Automated

Not sure exactly what parts you will have difficulty with, or exactly how you want to approach this. I would expect to add one or more additional data series (possibly formatted with invisible line and marker), then attach the appropriate data labels (values from cells) to those data series. It might be preferable to add those data series as XY scatter chart type (effectively creating a line + scatter combination chart), so that it will be easier to position the extra data series between the line chart categories. You would need to use concatenate functions/operations in order to combine all of the desired text into cells for the data labels.

I haven't spent any time with the specifics in your sample file. Are you familiar with adding data series to a chart? Familiar with combination charts (line + scatter, specifically)? Are you familiar with the different data label options?