IPA character (ħ) not recognised

Dear all,
I'm having an issue with one of the IPA character (vl pharyngeal fricative - ħ). When I used it in the following plot, it is rendered as an h, but this is different from ħ. Most of the symbols are recognizable except for ħ. Here is a list of IPA character . See the following reproduceable example. Could you please advice on what to fix that?

ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, fill=Species)) + 
  geom_boxplot()+
  scale_fill_manual(values = c("#8073ac", "#fdb863", "black"),labels = c("ħ", "ʕ", "ʃ"))

Sorry it is fixed now, just realised that I can use \u0127 for ħ.



ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, fill=Species)) + 
  geom_boxplot()+
  scale_fill_manual(values = c("#8073ac", "#fdb863", "black"),labels = c("\u0127", "ʕ", "ʃ"))
  
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