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Grounded power supply for an USB-C device?

Hello there!

Desperately looking for a power supply that would (exceptionally) include the grounding pin (!) in a view to discharge the electric field surrounding my "GPD pocket" aluminium tiny notebook (the same problem happens for every aluminium laptop like MacBooks), thus I would be glad if you can find a grounded power supply which might deliver an USB-C output suitable for my device (5v=3a/9v=2.67a/12v=2a).
Thanks in advance!