获取参考书目中以纯文本形式出现的参考文献列表

Question

如何获取文章的纯文本参考书目？（有些期刊要求在投稿时上传）

这是一个可以玩的 MWE。

\documentclass{article}
\usepackage[hyperref=true,
    natbib=true,
    backend=biber]{biblatex}

\begin{filecontents}{\jobname.bib}
    @article{einstein,
        author = {Albert Einstein},
        title = {the true about tree},
        journaltitle = {Annalen der Physik},
        year = {1905},
        volume = {322},
        number = {10},
        pages = {891--921}
    }
    @article{einstein2,
        author = {Albert Einstein the II},
        title = {the true about tree II},
        journaltitle = {Annalen der Physik},
        year = {1905},
        volume = {322},
        number = {10},
        pages = {891--921}
    }
\end{filecontents}
\addbibresource{\jobname.bib}

\begin{document}
    Paper\cite{einstein} Paper\cite{einstein2}.
    \printbibliography
\end{document}