Any USB-C audio adapter with DAC will work. Early Pixel models also didn't have an onboard DAC, so look for adapters that support Pixel 2 / 3 / 4 such as:

https://smile.amazon.com/Headphone-Adapter-ZOOAUX-Compatible-Samsung/dp/B087R2SGT1

I purchased two similar ones ages ago that are no longer available, and they both worked with my PH-1. Check reviews