Time series for meta data for labels

Hi, does anyone know of a way to embed text anchored to a timestamp?

I’d like to store free form text as a separate time series , and a timestamp associated with it.

Two immediate use cases but there’s probably many others

  1. Embed the start and end times of a test + name/description of the test.
  2. Injecting logfile events along side other charts

Ideally with the option of anchoring the label to the x axis, or onto the data point closest to it.

Eg something like this.