max wattage LED for esp32
No. You're way off.
If the output can provide 12mA at 3.3V that equates to (P=VI) 39.6mW.  Boosting the voltages does not increase the power. Assuming a 100% efficient boost circuit (which does not exist) you would just be boosting to 12V at 39.6mW - which means (I=P/V) 3.3mA.
You can't magic more power out of thin air - if you could we'd all have &quot;free energy&quot; devices powering everything. Instead we have power supplies or batteries.
And that is what you will need. A source for that extra power to come from.