Chamaca is a colloquial term in some Spanish-speaking regions, particularly Mexico and Central America, for a young woman or girl. It's similar to saying "chick" or "gal" in English, but generally less informal and can even be endearing.
In this song, it's used to describe the independent and strong female protagonist: "La chamaca nunca está en desventaja" (The young woman is never at a disadvantage). It adds a touch of regional flavor and a casual, yet affectionate, tone to the lyrics.
"Amor Con Rabia" opens with a claim, not a compliment: "Muchos te miran, pero yo solamente te toco" [Many look at you, but I only touch you]. The hook repeats the title as an instruction — "Házmelo con ganas, con amor y con rabia" [Do it to me with desire, with love, and with rage] — and that's really the whole song: tenderness and possessiveness in the same breath, neither one winning. The woman they're singing about isn't passive about any of it either: "Le gusta que la controlen, pero ella nunca le baja" [She likes to be controlled, but she never backs down].
Juhn's verse trades the jealousy for bragging — a private jet, "siete dígito' con par de cero'" [seven digits with a couple of zeros] in the bank, and a line that only makes sense in a reggaeton verse: "Eso allá atrás tiene más poderes que el guante de Thano'" [That thing back there has more power than Thanos' gauntlet]. It's a flex dressed up as a compliment, which is basically the genre in one line.