geom_GeomLabel() has yet to be implemented in plotly.

library(ggplot2)
library(plotly)

end_points <- iris %>% 
  group_by(Species) %>% 
  filter(Sepal.Length == max(Sepal.Length))

# Create the plot
g = ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, color = Species, group = Species)) +
  geom_line() + 
  geom_label(data = end_points, aes(label = Sepal.Length), color = "white", vjust = -0.5) +
  theme_minimal()

ggplotly(g)

Result:
Warning message:
In geom2trace.default(dots[[1L]][[1L]], dots[[2L]][[1L]], dots[[3L]][[1L]]) :
geom_GeomLabel() has yet to be implemented in plotly.
If you'd like to see this geom implemented,
Please open an issue with your example code at
https://github.com/ropensci/plotly/issues

I would like to see this implemented. Thanks for making a great package available in R!

まず、提供された R の例を実行し、geom_GeomLabel() に対する geom2trace.default 警告を追跡します。動作のリファレンスとして ggplot2 の geom_label の例を使用します。ggplotly が GeomLabel は未実装であると報告せずにラベルをレンダリングできれば完了です。