Top: Sonora Flame Skimmer models for varying metallicity [M/H] keeping other atmospheric parameters fixed. Circles show the synthetic F444W flux for each model. The inverted triangle marks the NIRCam 5σ upper limit. Increasing metallicity boosts both the CO₂ and CO feature strengths and suppresses the F444W flux. Bottom: same as the top panel but for varying strengths of disequilibrium chemistry (log K_zz), where 0 dex corresponds to a chemical equilibrium model. Increasing log K_zz (more vigorous mixing) boosts the strength of both the CO₂ and CO features and suppresses the F444W flux.