Display geom_line in tooltip of ggplotly?

ggplotly works well to plotly-ify my plot and display the information within the tooltip when the bars are hovered over.

But how can I get the tooltip to display the red line as well? Like when you hover over the red line, you will see something like "lineval: 10"



mydf <- data.frame("name"=c("alice","bob","simon"),

lineval <- 10

myplot <- ggplot(mydf, aes(x=name, y=value))+
  geom_hline(yintercept=lineval, color="red")


Try group=1 in the aex() of ggplot2, I think that helped me once.

If you're looking for any other examples, you might find them here:

Or here

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