Use a HP USB C power supply to charge my MacBook Pro

My opinion is use the correct charged provided by the maker ... HP or Apple.

Using chargers not designed for a device and not knowing the electrical characteristics of them is an invitation to trouble. Do you really want to risk relatively high investments all for the sake of not seeing a second charging cable on your desktop?

I don’t see a problem with it provided it’s a high quality power supply. Apple specifically went with USB-C because of the flexibility. I’ve been using a 30W Apple adapter (MBA died after an unfortunate food incident) with a Lenovo where the captive cable failed on its 45W adapter. I used them interchangeably when both worked. Apple says it’s fine.

Charge your MacBook Air or MacBook Pro - Apple Support

If your Mac has USB-C ports, you can charge your Mac with a USB-C charge cable and a USB-C power adapter or with a USB-C or Thunderbolt display that provides power. Your Mac charges over only one port at a time, so connecting multiple power adapters to the USB-C ports and MagSafe 3 port (if present) won't result in faster charging. If you connect more than one power source, your Mac charges only from the adapter or display providing the most power.