The headlight on reminder on a Jeep Wrangler (depending on the year and model) is typically indicated by a
light on the instrument cluster. It's not a separate light on the dashboard itself, but rather a symbol within the larger gauge cluster. The symbol usually depicts headlights.
There isn't a single, universal location for this indicator across all Jeep Wrangler models. You'll need to consult your owner's manual to locate it precisely for your specific Wrangler's year and trim level.