Label only extreme legends in a map

Hi there!

I am trying to plot a coefficient number for each state of Argentina and I want to label the extreme higher values as "Similar Income" and label the lowest as "Different Income".
I have something like this

ggplot(arg_sf) +
  geom_sf(col = NA, aes(fill=(VALORES))) +
  scale_fill_gradient(low = "green", high = "green4")


So far this is my result and it is exactly what i want, but i would like to remove the legends and add two in the extremes, with the text i mentioned before: green4="Similar Income" and green="Different Income"

Do you have any hint about how to solve it?

Thank you,

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