Several reported C/O ratios for a wide range of exoplanets based on JWST observations are shown, plotted against their equilibrium temperatures, with the estimated C/O ratio for WASP-19b from this work highlighted by the magenta bow-tie symbol. A step-function model illustrating the potential onset of supersolar C/O ratios in UHJs is shown, along with a quadratic polynomial model representing a gradual increase of the C/O ratio with equilibrium temperature, both with their corresponding 1σ uncertainties.