Using the ceiling symbol (⌈ ⌉) in ggplot facet labels

An example code is shown below, but I cannot remove the word 'expression' and the parentheses (). I would like to remove them. An entirely different way to accomplish the same thing (i.e., showing the ceiling symbol in the panel label) is also acceptable.

library(ggplot2)
library(latex2exp)


df_test <- data.frame(
  x = 1:2,
  y = 1:2,
  group_original = c("ABC", "DEF") 
)

final_facet_labels_expressions <- list(
  "ABC" = TeX("$qqq+\\lceil T_{ABC} \\rceil$"),
  "DEF" = TeX("$qqq+\\lceil T_{DEF} \\rceil$")
)


df_test$group <- factor(df_test$group_original,
                        levels = names(final_facet_labels_expressions), 
                        labels = final_facet_labels_expressions)     


ggplot(df_test, aes(x, y)) +
  geom_point() +
  facet_wrap(~ group, labeller = labeller(group = label_parsed)) +
  theme_bw()

library(ggplot2)
library(latex2exp)


custom_labeller <- function(labels) {
  tex_expressions <- list(
    "ABC" = TeX("$qqq+\\lceil T_{ABC} \\rceil$"),
    "DEF" = TeX("$qqq+\\lceil T_{DEF} \\rceil$")
  )
  result <- lapply(labels, function(x) {
    lapply(x, function(level) tex_expressions[[level]])
  })
  
  return(result)
}

ggplot(df_test, aes(x, y)) +
  geom_point() +
  facet_wrap(~ group_original, labeller = custom_labeller) +
  theme_bw()

^{Created on 2025-07-31 with reprex v2.1.1}