ubuntu-cloudimg-query does not contain serial in output tokens

subst "$format" \
  '\\n' "$CR" '\\t' "$TAB" \
  '%{ami}' "$ami" \
  '%{arch}' "$arch" '%{bname}' "$bname" '%{dlpath}' "$dlpath" \
  '%{ptype}' "$ptype" '%{pubname}' "$pubname" '%{region}' "$region" \
  '%{release}' "$release" '%{store}' "$store" '%{stream}' "$stream" \
  '%{url}' "$url" \
  '%{xarch}' "$xarch" '%{itype}' "${itype}" '%{itypes}' "$itypes" \
  '%{summary}' "${region}/${prefix}/${pubname}"

There is no 'serial' there.
this is useful for comparing.