pie chart highcharter R

I am plotting a pie chart using highcharter. when the mouse hover on each slice< it only shows just one value, but I want to add another value so that it shows two! here is a sample code: in my code you see that it is ploting the data using just A column and B column, but I want it to show C column as additional information as the mouse hover on slices.

library(highcharter)
A <- c("a", "b", "c", "d")
B <- c(4, 6, 9, 2)
C <- c(23, 26, 13, 15)
df <- data.frame(A, B, C)

highchart() %>% 
  hc_chart(type = "pie") %>% 
  hc_add_series_labels_values(labels = df$A, values = df$B)%>%    

  hc_tooltip(crosshairs = TRUE, borderWidth = 5, sort = TRUE, shared = TRUE, table = TRUE,
             pointFormat = paste('<b>{point.percentage:.1f}%</b>')
  ) %>%

  hc_title(text = "ABC",
           margin = 20,
           style = list(color = "#144746", useHTML = TRUE))