title: How to add wilcox_test results from rstatix to ggboxplot() using stat_pvalue_manual?
body: <p>I am trying to create a boxplot and manually add p-values to each comparison between boxplots:</p>
  
  <pre><code>    #I have the following boxplot
      ToothGrowth%&gt;%ggplot(aes(x=dose, y=len, fill=supp))+
        geom_boxplot()
  
      #I would like to do a wilcoxon sum rank test on the data and label each comparison between OJ and VC
      stat.test &lt;- ToothGrowth%&gt;%group_by(dose)%&gt;%wilcox_test(len~supp, p.adjust.method = 'BH')%&gt;%
        mutate(y.position = c(29, 35, 39))
      stat.test
      #I try to add the p-values to my boxplots
      ToothGrowth%&gt;%ggplot(aes(x=dose, y=len, fill=supp))+
        geom_boxplot()+
        stat_pvalue_manual(stat.test, label = 'p')
  
      #However I get the following error:
      # Error in FUN(X[[i]], ...) : object 'supp' not found
  </code></pre>