`xparse` instructions and `enumitem` formatting appear to be lost on `pandoc`

xparse instructions and enumitem formatting appear to be lost on pandoc (inline and {{; }} in this case). It’s been pointed out conversion from LaTeX to TeX is not possible, so what are the options?

documentclass{article}
usepackage{enumitem}
usepackage{xparse}

newlist{foo}{enumerate*}{1}
setlist[foo]{label=arabic*), itemjoin={{; }}}

ExplSyntaxOn
tl_set:Nng__erw_foo_tl{item textbf{a}item b} % 

NewDocumentCommandFoo{}{tl_use:Ng__erw_foo_tl}
NewDocumentCommandBar{}{item textbf{c}item d}
defQux{item textbf{e}item f}

ExplSyntaxOff

begin{document}

begin{foo}
  FooBarQux
end{foo}

end{document}

CLI

$ pandoc -f latex -t plain jobname.tex
E

f