Coordinates for annotations in plot

When using annotations in plot, I understand that the coordinates correspond to those displayed on the axis. Is there a way to also give “window” coordinates like in gnuplot, where the coordinates in horizontal and vertical directions are between 0 and 1?

You need to specify which of the dozen different plotting libraries you are using.

using Plots
pyplot()

No, “window coordinates” for annotations are not implemented in Plots.