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What remains to add an LED:
Confirm what kind of LED you want:
simple status LED, or
another WS2812/addressable LED.
Choose where it connects:
power indicator across 3.3 V or 5 V, or
GPIO-controlled indicator from the ESP32.
Add the LED plus the correct current-limiting resistor if it is a standard LED.
Wire it into the schematic and run review checks for ERC issues.
Recommended default if you want a basic indicator: add a standard green LED + 1 kΩ resistor from 3.3 V to GND as a power/status LED.