The PadRight command returns a list of a specified length padding the list with zeros on the right.

$\mathrm{with}\left(\mathrm{MmaTranslator}\left[\mathrm{Mma}\right]\right)\:$

$\mathrm{PadRight}\left(\left[a\,b\,c\,d\,e\right]\,9\right)$

$\left[a\,b\,c\,d\,e\,0\,0\,0\,0\right]$

$\mathrm{with}\left(\mathrm{MmaTranslator}\right)\:$

$\mathrm{FromMma}\left(\mathrm{`PadRight[\{a,\; b,\; c,\; d,\; e\},\; 9]`}\,\mathrm{evaluate}\right)$

$\left[a\,b\,c\,d\,e\,0\,0\,0\,0\right]$