Using Google's annotated timeline in the Visualizations API, can you insert annotations irregardless of data set?

Question

I can insert annotations on specific datasets on the graph but I wish to have multiple lines on the graph without associating the annotation with a specific line, but with a date instead.

Here is an example of what I want to do. Notice the bubbles appended to the x-axis and not a specific line on the graph.

I've read through the API and can't see an option like this but wondering if someone knows a way.

Thanks.

Answer 1

No experience, but my instant reaction was that you might try a series with the annotations attached with all zeros as the data - and exclude it from the legend?