Bigger matching brackets in every level [duplicate]

Question

I have the following formula:

Is there an elegant way to make the matching brackets of one level a little bigger than the matching brackets of the previous one?

Normal -> () -> Bigger -> [] Bigger -> {}

\documentclass{article}
\usepackage{parskip}
\setlength{\parindent}{0cm}
\usepackage{amsmath}
\usepackage{unicode-math}
\usepackage{fontspec}
\usepackage[greek,english]{babel}
\setmainfont
[
    Ligatures=TeX,
    Extension=.otf,
    UprightFont=*,
    BoldFont=*Bold,
    ItalicFont=*It,
    BoldItalicFont=*BoldIt,
    Mapping=tex-text
]{GFSArtemisia}
\setsansfont[Mapping=tex-text]{GFSArtemisia.otf}
\setmathfont{latinmodern-math.otf}
\setmathfont[range=\varnothing]{Asana-Math.otf}
\setmathfont[range=\int]{latinmodern-math.otf}
\usepackage{lipsum}

\begin{document}

Formula:
%
\Eqs
{
  y_{n+1}=y_{n}+\frac{h}{2}\{f(x_{n},y_{n})+f[x_{n}+h,y_{n}+hf(x_{n},y_{n})]\}
}

\end{document}