How do I make text bold AND italics at same time in base R plot?

Let’s say I have a plot:

plot(1:5,1:5, main = "Plot Title here")

How do I make my main title both bold and italic?

I can make it bold or italic, but I’ve been unable to acheive both simultaneously.

main = expression(italic("Plot Title here"))          #makes italic
main = expression(bold("Plot Title here"))            #makes bold
main = expression(bold(italic("Plot Title here")))    #still only makes italic!

>Solution :

From ?plotmath:

main = expression(bolditalic("Plot Title here"))   
plot(1:5,1:5, main = main)

^{Created on 2023-04-03 with reprex v2.0.2}