No LED will work at 12V without blowing up so you would need a resistor. If you wire it with resistors then you have to wire it in parallel so you don't resist the main turn-on voltage which means the Diode feature actually wouldn't work.
What siberia37 said. Any 12V LED you find will either have multiple LED dies within the package in series or have power regulation circuitry built into it. In both cases it'll drop the voltage significantly.
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