How to find From address from the transaction

Hi
In the transaction object, i could see TO address, message, hash etc…
But how do i find which nem address sent it? ( there is only the signer)

from: https://bob.nem.ninja/docs/#requesting-the-account-data

Example:

http://127.0.0.1:7890/account/get/from-public-key?publicKey=f9bd190dd0c364261f5c8a74870cc7f7374e631352293c62ecc437657e5de2cd

(publicKey = signer)

Awesome. Thanks