If the part you're stuck on is what to do when the values you want as bar labels aren't already in your data frame (since geom_bar() is calculating the counts for you), then this StackOverflow answer shows how to do it:
By the way, the code you posted has a couple of different syntax errors and won't run as-is. We strongly encourage people posting here to use the tools in the reprex package, which helps to catch that sort of thing before you post.