en_tn_lite_do_not_use/eph/01/12.md

so that we, who are the first to hope in Christ

The pronoun "we" refers to Paul and the other Jewish believers, not to the Ephesian believers.

the first to hope in Christ

"the first people to hope in Christ." They confidently expected that Christ would fulfill God's promises.

so that we, ... Christ, would be for the praise of his glory.

Possible meanings are "so that we, ... Christ, would praise him for his glory" or "so that people would praise God for his glory because of us who ... Christ."