Brackets next to subsections

Question

I created a long list using itemize, minipages and sections/subsections...

Now, I would like to replace the subsection text by a bracket that is placed next to the equations of each subsection. See image:

Is that possible? The brackets can be aligned, but they don't have to.

CODE:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\section{A List}
\subsection{$O(\epsilon^0)$}
\begin{itemize}
    \item $\partial_{\mathrm{z}}\Tilde{\pi}{0}$
    \item $\Tilde{\Theta}{0}$
\end{itemize}
\subsection{$O(\epsilon^1$)}
\begin{minipage}[t]{0.5\textwidth}
\begin{itemize}
    \item $\nabla_{\mathrm{m}}\cdot\mathbf{v}{0,\mathrm{m}}$
    \item $\frac{\alpha{\mathrm{w}}}{\Bar{p}}\partial_{\mathrm{z}}(\Bar{p}w_{1})$
    \item $\alpha_{\mathrm{w}}w_{1}\partial_{\mathrm{z}}\Bar{\Theta}$
\end{itemize}
\end{minipage}
\begin{minipage}[t]{0.5\textwidth}
\begin{itemize}
    \item $\nabla_{\mathrm{m}}\cdot\mathbf{v}{0,\mathrm{m}}$
    \item $\frac{\alpha{\mathrm{w}}}{\Bar{p}}\partial_{\mathrm{z}}(\Bar{p}w_{1})$
\end{itemize}
\end{minipage}
\end{document}