pandoc does not read abstract from latex as meta data

pandoc does not read abstract from latex as meta data

[Abhishek Ulayil]

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Hi everyone,
 I recently learned that pandoc does not read \abstract{} as raw text but 
as metadata. 
But when I try to convert a Latex file into markdown with standalone 
parameter, the abstract does not appear in YAML metadata headers. I cant 
use lua filters in any manner, because the abstract does not even appear in 
abstract syntax tree. 

Is this an intended outcome or I am missing out on something. If so how can 
I get the abstract content in YAML metadata.

source file (example.tex):

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\author{Abhishek U}
\title{\pkg{texor} Hello}
\abstract{This is a sample abstract that must be included in the
converted document.
This is multiline example.
}
\begin{document}
\maketitle
Hello world \pkg{texor}
\end{document}

The command for ast 

pandoc +RTS -K512m -RTS example.tex --to native --output example-ast.txt 
-s  --citeproc

The command for markdown:

pandoc +RTS -K512m -RTS example.tex --to markdown --output example.md -s   
--citeproc

pandoc version 2.18

Thanks in advance

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