One of the unique features of MacBook devices, is that as of the 2019 16", they can charge off of as little as 5V. I have powered mine from a power bank and cab

One of the unique features of MacBook devices, is that as of the 2019 16", they can charge off of as little as 5V. I have powered mine from a power bank and cable that did not support "fast charging" (I think it topped out at 2-3A) and the computer charged just fine off it, albeit exceptionally slowly and barely at all when running. If you are curious about what works with what, there is a YouTube channel called ChargerLab that tests different devices plugged into different chargers.