Its of Faith that it might be of Grace, faith is the product of Grace Rom 4:16
16 Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,
Faith is by Grace , its right there in your face !
That simply shows that salvation through faith is consistent with salvation by grace and not a statement faith is a grace gift
Romans 4:16 (NASB 2020) — 16 For this reason
it is by faith, in order that it may be in accordance with grace, so that the promise will be guaranteed to all the descendants, not only to those who are of the Law, but also to those who are of the faith of Abraham, who is the father of us all,
the context shows it is righteousness which is represented by the pronoun it
Romans 4:9–15 (NASB 2020) — 9 Is this blessing then on the circumcised, or on the uncircumcised also? For we say, “FAITH WAS CREDITED TO ABRAHAM AS
RIGHTEOUSNESS.” 10 How then was it credited? While he was circumcised, or uncircumcised? Not while circumcised, but while uncircumcised; 11 and he received the sign of circumcision, a seal of the righteousness of the faith which he had while uncircumcised, so that he might be the father of all who believe without being circumcised, that
righteousness might be credited to them, 12 and the father of circumcision to those who not only are of the circumcision, but who also follow in the steps of the faith of our father Abraham which he had while uncircumcised. 13 For the promise to Abraham or to his descendants that he would be heir of the world was not through the Law, but through the
righteousness of faith. 14 For if those who are of the Law are heirs, then faith is made void and the promise is nullified; 15 for the Law brings about wrath, but where there is no law, there also is no violation.
which by faith and that establishes righteousness is by grace
You have misinterpreted the passage