I don’t know what the answer is, but I doubt that this language was intended as a hint of the Trinity. It makes no hint of three, in particular, and the OT was scrupulous in warning people away from polytheism and insistent on monotheism.
Of course, the Trinity is still one God, and monotheistic. But Old Testament peoples would have no way of coming to that knowledge without the revelation of Christ.
And it seems a stretch that the language would be intended for Christians rather than its original hearers. But I could be wrong.