Beginner: highlighting categorical data

[shipyardsdotter]

Hi R users,
I'm thinking is it possible to use gghighlight to highlight categorical data?
Here's my hypothetical example:

Lets say I have a list of employees that are going to be promoted: It's JD and AA. I want to highlight these guys on the graph, while keeping everything I have going on.

I'm still quite new to R studio so any advice is highly appreciated!

[nirgrahamuk]

Hello, Thanks for joining the forum.
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[shipyardsdotter]

Sure thing! Thank you for the tip, you're right that makes it much easier.
Here's the code:

library(tidyverse)
library(ggforce)
library(ggplot2)
employee <- c('JD','PG','JH', 'JJ','AA', 'BB')
salary <- c(21000, 23400, 26800, 27000,21500, 25500)
employ.data <- data.frame(employee, salary)

ggplot(data = employ.data) +
  aes(y = salary, x= "Employees")+ 
  ggforce::geom_sina(col=ifelse(employ.data$salary>=22000, rgb(255,0,0,120,maxColorValue=255),rgb(0,0,0,100,maxColorValue=255))) +coord_flip()+
  geom_abline(intercept=22000,slope = 0,lty=2)+
  theme_minimal()+theme(axis.line = element_line(colour = "black", size = 0.5, 
                                                 linetype = "solid"))+
  scale_y_continuous(breaks=seq(20000,25000,28000))+ labs(y="Salary")

I guess I might have to create a separate variable that answers the question Is the employee on the 'promotion list' and maybe use that?