In contrast, Vanessa Williams (who might be a model for J.Lo's interpretation) adopts a POV as both a Narrator (who tells the story of the Spider Woman), and also slips in vocal techniques in the telling that conjure the character of the Spider Woman. In other words, she's singing as both a Narrator and the Spider Woman.
I can hear a vocal differentiation in Williams' performance where as Narrator, her diction is crisp, clean and she employs the vocal techniques of a trained singer (i.e., when she sings the word, moon, her /oo/ vowel is gorgeously lush, and she finishes the phrase with perfect diction on the word, dimmer). When she slips into the Spider Woman Woman, her vocals are more "slithery" and snake-like (i.e., when she sings, “…at the tide’s low end.” She hits the word “low” with a vocal technique that places the word in her nose, rather than lower in the mouth, so the word sounds more sinister. Williams' calculated use of legato also helps create a mood and tone for the character.
I don't find that J.Lo has the vocal training to match Williams. But, I find many instances in J.Lo's performance where her interpretation aligns closely with Williams' (and as both performances are linked in this thread, anyone can compare the two for themselves).