I stumbled upon a line from Jerome's QHG, in which he wishes to refute a belief in circulation 200 years prior that the Hebrew of Gen 1:1 read:
'In the Son, God made the heaven and the earth.'
Jerome's purpose is to refute certain Greek readings in favor of Hebrew. I mention this random nugget as it certainly adds to the picture. I suspect Jerome had glossed the earlier theological debate surrounding Gen 1:1 much like he did in other contexts. He was likely mistakenly refuting a Christian Targum/paraphrase. What is really important is the theology inferred.
Jerome himself was passionate about Logos theology; mirroring Philo is just about every way apart from the insistence upon incarnation which Philo was agnostic about. So, in this refutation of the reading of Genesis he wasn't necessarily disagreeing with the concept expressed he was correcting an assumed translational error.
Here is a summary of Jerome's Logos theology from the web:
Justin’s Logos is God’s instrument of revelation to humans (Dial. 128.2). The whole world come into being by a “Word of God” (Dial. 84.2; 1 Apol. 59.5; 64.5; 2 Apol. 5.3).[3] The Logos goes under various names from Scripture such as “Glory of the Lord,” “Son,” “Wisdom,” “Angel,” “God,” “Lord,” “Logos,” and “Commander” (Dial. 61.1; cf. 126.1; 128.1). The Logos is the seed of reason by which philosophers and barbarians were able to know the truth (1 Apol. 5.4; 46.1-6; 2 Apol. 13.3-6). The “divine Logos” moved the prophets to prophesy (1 Apol. 36.1). Jesus as the Logos is, then, that “rational power” (Dial.61.1) or “rational principle” (2 Apol. 10.1), who “acquired physical form and became a human being” (1 Apol. 5.4; 23.2; 63.10) by taking on “flesh” (1 Apol. 32.10; 66.2; Dial. 45.4; 84.2; 100.2).[4] He was “born from God … as Logos of God” (1 Apol. 22.2), born in a special manner from a virgin (Dial. 63-70; 1 Apol. 21.1-2; 22.2; 23.2; 32.10-33.9; 46.5; 63.16).