Which HP Chromebook do you have?
If you have one that charges via USB Type C, you can simply buy a third party charger like https://amzn.to/3vPgLCK and a white USB cable such as https://amzn.to/2XKx7jd
If you have a device that charges via a proprietary charger, your options are limited. There are some third party options for some but the quality can be questionable.