How can I strip a leading zero from an expression rendered by plotmath?

Question

Due to a journal's requirements, I need to format p values as capital, italic P and the values themselves without leading zero, for example, P = .01. I would like to include some p value labels in plots of mine.

My trouble is that I need to use plotmath expressions in order to render an italic P (as far as I know) but plotmath always renders the value with a leading zero even if I enter a string without it. As an example

ggplot2::ggplot(data.frame(x = 1, y = 1)) +
  ggplot2::geom_text(x = 1, y = 1, label = "italic(P) == .01", parse = TRUE)

^{Created on 2021-05-03 by the reprex package (v1.0.0)}

Does anyone know a solution to this problem? I guess either removing the leading zero with plotmath or italicizing the P without plotmath are possible options.

Answer 1

One way would be to use the number as string.

ggplot2::ggplot(data.frame(x = 1, y = 1)) +
  ggplot2::geom_text(x = 1, y = 1, label = "italic(P) == '.01'", parse = TRUE)