How to display number of cases per group in a stacked bar plot?-CodePudding

I am attempting to produce a stacked bar plot that has the fill color defined by a variable and also shows the number of cases represented by each of the filled sections.

Reproducible example:

library(tidyverse)

data(mpg)

ggplot(mpg,aes(manufacturer)) 
  geom_bar(position = "fill",stat = "count",aes(fill=drv)) 
  theme_classic() 
  theme(text = element_text(size=20),
        axis.text.x = element_text(angle = 45, 
                                   vjust = 0.5))

which produces this image .

Here is a paired-down version of what I would like to produce programmatically:

, where the

n=...

are centered on each groups filled section and display the number of cases per group (drv) in each category (manufacturer).

Additionally, I have tried (unsuccessfully) incorporating code from