How to use a Latex package in Plots with GR backend?

General Usage
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In PyPlot.jl, for example

using PyPlot, LaTeXStrings

rcParams = PyPlot.PyDict(PyPlot.matplotlib."rcParams")
rcParams["text.latex.preamble"] = "\\usepackage{siunitx}"

help me to directly use a Latex command from siunitx package like L"\si{\nm}".

Is there any possible way to do the same thing in Plots.jl with a gr() backend?