In ggplot2 how to add angled label to donut chart

Question

Below code can draw donut chart as the left one in attached image, how to change the label as the right one? Thanks!

library(tidyverse)
pie_data <- data.frame(category=c('A','B','C'),sales=c(70,25,40))
pie_data %>% ggplot(aes(x=1,y=sales,fill=category))+
  geom_col()+
  scale_fill_brewer(direction = -1)+
  geom_text(position=position_stack(vjust=0.5),aes(label=paste0('Category ',category,':',sales)))+
  xlim(-1,2)+
  coord_polar(theta = 'y')+
  theme_void()