ltablex hack in LatexML?

I need to access to ltablex-like functionality within the confines of the packages available to LatexML. Namely, a long table that needs to have wrapped text in columns. Ordinarily, I’d do something like

documentclass{article}
usepackage{ltablex}
usepackage{booktabs}
begin{document}

label{lab:aLabel}
begin{tabularx}{linewidth}{cX}
caption{A caption.}
toprule
A & Some long stuff that needs to wrap.
B & More stuff that needs to wrap.
bottomrule
end{tabularx}

, but LatexML doesn’t support ltablex. Any alternative to pasting all of ltablex.sty into my preamble?