'In `geomtextpath/geom_textline`, is it ok to use `y/x` value to change label position

In geomtextpath/geom_textline, we can change the label position using parameter vjust/hjust, is it ok to use y/x value directly. Thanks!

library(ggplot2)
library(geomtextpath)
ggplot(economics, aes(date, unemploy)) +
  geom_textline(linecolour = "grey", size = 4, vjust = -1,hjust=0.35,
                label = "1990s Decline" , text_smoothing = 30)

r ggplot2 geom-text

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'In `geomtextpath/geom_textline`, is it ok to use `y/x` value to change label position

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