Conditional label depending on the input of a custom function in ggplot2 in R

Suppose I have the following function:

  my_function <- function(date1, date2, variable, quota, monthly_business_days) {
    value <- deparse(substitute(variable))

    my_data %>%
      filter(between(DATE, ymd(date1), ymd(date2))) %>% 
      summarize(total = sum()) %>%
      add_row(total = quota, .before = 1) %>% 
      rbind(.$total[[2]]/bizdays(date1, date2)*monthly_business_days) %>%
      mutate(indicator = if(value == 'UNITS') c("Quota (Units)", "Sales (Units)", "Forecast (Units)")
                   else c("Quota (USD)", "Sales (USD)", "Forecast (USD)")) %>% 
      mutate(indicator = as_factor(indicator)) %>% 
      mutate(across(where(is.numeric), ~round(., 1))) %>% 
      ggplot(aes(x = indicator, y = total)) +
      geom_col(fill = "aquamarine3", color = "black") +
      geom_label(aes(label = total), size = 8) +
    if(value == UNITS) {
        labs(x = "", y = "Units") +
    } else if(value == SALES) {
        labs(x = "", y = "USD") +
    } else {
        labs(x = "", y = "") +
    }
      theme(axis.text = element_text(size = rel(1)))
  }

I would like to include labels in my plot from ggplot2 depending on the function's input. Please bear in mind that this input is being used to select a specific column from "my_data" data frame. I'm not sure whether to use "variable" or "value". None of those seem to work.

Thanks!