I want to annotate a chart with a vertical line at a specific
timepoint on a time series hAxis.

in GNUPLOT, you can do this kind of arbitrary annotation vertically
with

"set arrow nohead from graph 0.1390,0 to graph 0.1390,1 as 1"

for instance, (graph specific offset from x,y base point)

or

plot 0.3 with lines lw 2 notitle

to 'fake' it in as a dataseries.

I guess I could use a mixed Combo Chart, and have this one special
datapoint added to the plot, but I'm wondering if the googleoids have
a more 'neat' way to do this.

Note: I know about the 'annotation' type of addition to data, and that
isn't what I mean by 'annotate' this time. Its not uncommon to want to
add arbitrary circles, lines, points, emphasis to a chart, and not
always easy to tie it to specific data..

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