Relative placement of annotations

[oracle5th]

Is it possible to place annotations at relative position of the plotting panel like legend_position_inside?

Similar to this ggplot issue:
tidyverse/ggplot2#1244

However, the solution given by Hadley for ggplot2 does not seem to work in plotnine.

[has2k1]

It should work with

annotate("text", -float("inf"), float("inf"), label = "Top-left", ha = "left", va = "top")

[oracle5th]

Thank you for the quick reply!
Your solution works nicely, but it can only place the annotation at the very corner. If I want it at (0.2, 0.8), so as to leave some space from the corner, I can change the values of hjust and vjust in ggplot2 to achieve that.

However, in plotnine, ha and va only support fixed string values. I assume this is a limition of matplotlib. Is there a workaround?