How do I dynamically change the sign of ggplot labels but not the underlying data?

I am creating a population pyramid in ggplot and in order to get the bars to show correctly, I have changed the sign of one category to negative by multiplying the variable by -1.

The problem is now that I have the bars looking correctly but the axis labels show negative numbers. I am wondering how I change the sign dynamically (i.e. I cannot manually specify specific labels because the charts are being created in a loop and some will have different ranges). The code for the plot and an image are below.

Thank you

PyramidPlot <- ggplot() +
  geom_bar(data = PopEDMalesFullLessT, aes(x = Age, y = Percentage, fill = "red"), width= 0.4, 
           position = position_nudge(0.22), stat = "identity") +
  geom_bar(data = PopEDFemalesFullLessT, aes(x =  Age, y = Percentage, fill = "blue"), width= 0.4,
           position = position_nudge(0.22), stat = "identity") +
  scale_x_discrete(name = "Age Group")+
  labs(fill = "Legend") +
  theme_classic()+
  theme(axis.text.x = element_text(margin = margin(t = 0.25, unit = "in")),
        axis.title.x = element_text(margin = margin(0.1, 0, 0.1, 0)),
        legend.position = c(0.9, 0.9)
  )+
  coord_flip()+
  scale_fill_discrete(labels=c('Males', 'Females'))

>Solution :

You can give functions to the labels argument of a ggplot scale, in which case the function will be applied to the default labels. In this case, the absolute value function abs will work. See ?continuous_scale for details and other options.

data.frame(x = 1:3, y = (-1):1) |> 
  ggplot(aes(x, y)) + geom_point() + 
  scale_y_continuous(labels = abs)