Adding a comment fill color in Excel using openxlsx

Question

I'm creating Excel files using an R script. In the script, I want to add comments to several cells and then edit the style of these comments. So far, I have seen that I can use the createStyle() function to define the font color, font size, fill color etc. Then use the createComment() function to enter a text and apply this style. In the end, writeComment() is used to write the comment in the workbook in a specified cell. An example would be the following:

wb <- createWorkbook()
addWorksheet(wb, "Sheet 1")
s1 <- createStyle(fgFill="#FF5733")
c1 <- createComment(comment="This is a comment.", style=s1)
writeComment(wb, 1, col=1, row=2, comment=c1)

However, I have read in the documentation (and in the code on GitHub: https://github.com/ycphs/openxlsx/tree/master) that when adding a style to the comments, only the font related settings are copied, whereas the background color settings are only taken into account when using the addStyle() function to edit the cell, not the comment on that cell.

Therefore, the previous block of code gives the following content inside the comments variable of the workbook wb:

> wb$comments[[1]][[1]]
$ref
[1] "A2"

$author
[1] "admin"

$comment
[1] "This is a comment."

$style
[1] "<rPr><sz val=\"11\"/><color rgb=\"FF000000\"/><name val=\"Calibri\"/></rPr>"

$clientData
[1] "<x:ClientData ObjectType=\"Note\"><x:MoveWithCells/><x:SizeWithCells/><x:Anchor>1, 15, 0, 10, 2, 147, 5, 18</x:Anchor><x:AutoFill>False</x:AutoFill><x:Row>1</x:Row><x:Column>0</x:Column><x:Visible/></x:ClientData>"

As seen above, only the default font settings were saved (size 11, color black, font Calibri), but the background color was ignored.

My question is: is there a way to add the background color (fill) to the comments in Excel, using R and openxlsx? My ultimate goal is to add an image as the comment background (this possibility is available inside Excel), but for starters just changing the color would be nice.