Can i set a temp variable in template?

<Index each={bigList()}>{(item, i) =>
  // access item().aaa.bbb.ccc.zzz
  // access item().aaa.bbb.ccc.xxx
  // access item().aaa.bbb.ccc.ccc
  // access item().aaa.bbb.ccc.vvv
  // access item().aaa.bbb.ccc.bbb
  // access item().aaa.bbb.ccc.nnn

  // can i set `item().aaa.bbb.ccc` to a temp variable?
}
</Index>