I have a line chart that I've created in Google Sheets. This line chart is published to the web and embedded in another website as an iframe.
I have a cell in the underlying data that updates with a timestamp each time the underlying data is edited.
I would like to display that timestamp value somewhere on the chart so users will know when that chart was updated. However, I can't find a way to display static text in an arbitrary location on the chart. Is there any way to do this?