The PDTricker Fast Charge Deception Tool by Muse Lab connects to a USB-C PD source, and can produce voltages on an output USB-C port of 5, 9, 12, 15, and 20V. Voltage selections are made via an onboard button, and indicated by a series of LEDs. Code that runs it is available on GitHub, along with the schematic if you’d like to examine how it works. It’s based on the CH224K chip, though the datasheet there appears to be in Chinese.
One might understandably be nervous about using a USB-C to USB-C “tricker” inline with expensive electronics, and/o or leaving it unattended. Where it would seem to shine, however, would be for test applications, where you don’t want to drag out a full featured DC power supply, and a 5/9/12/15/20V source would be sufficient. For this purpose, the device can be ordered with a USB-C alligator clip cable, allowing you to power up that motor (or other thing) that you want to test at your desk with an Arduino.
Impressively, the device is able to deliver 5A at 20V, though this will of course depend on your power supply. It can also has a pair of VOUT/GND through holes, on which you can solder your own leads if you prefer to forgo the USB-C output altogether.