In this plot
library(ggplot2)
df <- data.frame(year = c(2011,2012,2013,2014,2015,2016,2017,2018),
value = c(337,423,551,661,846,1387,2222,3580))
ggplot(df, aes(year, value)) +
geom_point() +
geom_line() +
geom_text(aes(label = value, y = (value - 50)*0.9))
How is it possible to make the color of numbers of value red?

