Jacob was the child of Isaac who was the child of Abraham. Jacob had an older brother, Esau, who should have been the child of promise but Esau sold his birthright to Jacob.
Jacob wrestled with an angel who told him his name was to be Israel from then on.
Israel had twelve sons one of which was Judah. It was through Judah that the promise to Abraham was fulfilled. Jesus is the lion of the tribe of Judah.
In the New Covenant being a Jew or a Greek is irrelevant.
In the Old Testament the Children Of Israel was equivalent to the Chosen People which was equivalent to the Children Of God.
In the New Testament the Children Of God are believers in Christ Jesus who have received His Holy Spirit - Born Again.
Hence the Chosen People are those in the Body Of Christ.
Furthermore, the Children Of Israel are those in the Body Of Christ.
The promises of the Lord in His Word are to those who receive Him by Grace Through Faith in Word and Spirit.
The Lord Jesus Christ is the Incarnate Word and the express image of His Holy Spirit.
Jewishness is not a qualification with the Lord.
A broken and a contrite spirit who hungers for fellowship with the Holy Spirit and sees Him In Christ Jesus is qualified.