The \mathlarger command from relsize package does not work for .md -> .docx conversion.

[J <lixichen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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The \mathlarger command from the relsize package works for .md -> .pdf 
conversion but not for .md -> .docx conversion. 

Could you help to suggest how to make it work for .md -> .docx conversion ? 
Many thanks !

$ pandoc MWE2.md --mathml --filter=pandoc-crossref --filter=pandoc-citeproc 
-s -o MWE2.pdf  --pdf-engine=xelatex
$
$ pandoc MWE2.md --mathml --filter=pandoc-crossref --filter=pandoc-citeproc 
-s -o MWE2.docx
[WARNING] Could not convert TeX math ' \lim\limits_{r\to\infty} 
U_{X}^{\sigma} = -\mathlarger{\frac{1}{r}} \qquad(1)', rendering as TeX:
  igma} = -\mathlarger{\frac{1}{r}} \qquad
                     ^
  unexpected "{"
  expecting "%", "\\label", "\\nonumber" or whitespace
$


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---
geometry: top=3.18cm, bottom=3.18cm, left=2.54cm, right=2.54cm
mainfont: Times New Roman
CJKmainfont: FangSong
fontsize: 12pt
header-includes:
    - \usepackage{caption}\captionsetup{singlelinecheck=false,justification=centering}
    - \usepackage{setspace}\onehalfspacing
    - \usepackage{xcolor}
    - \usepackage{relsize}
---

The *exact* asymptotic behavior of the exchange-energy density of any finite many-electron system is known, and is given by 

$$ \lim\limits_{r\to\infty} U_{X}^{\sigma} = -\mathlarger{\frac{1}{r}} $$ {#eq:asymptotic}

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