Coloring the checkboxGroupInput choices

In my Shiny UI I have

ui <- checkboxGroupInput("my_cbgi", "Choose Something", c("A", "B", "C", "D"))

And I would like it so that the choices (the text) A and B are colored red, but C and D are not. I tried HTML but then in the UI weird boxes like "attribs" and "children" showed up.

Thanks in advance