How to use bold, italic and underline in ggplot2

How can I use bold, italic and underline in a graphic title or axis in ggplot2?

You can make text bold or italic by setting the face of the text element. I do not know how to make an underline but I'll come back with the answer if I find it.

ggplot(DF, aes(X,Y)) + geom_point()+labs(title="The Title") +

ggplot(DF, aes(X,Y)) + geom_point()+labs(title="The Title") +
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It worked @FJCC. Thank you!

Her is a way to underline. Notice the use of ~ to make spaces within expression().

ggplot(DF, aes(X,Y)) + geom_point() + labs(title = expression(underline(The~Title)))
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