See https://dancharblog.wordpress.com/2020/05/10/bi-directional-usbc-dp-cables/#hdmi-2-0-usb-c-adapters-single-direction

If your external portable monitor needs power and video from the same USB-C cable, the only options are the Goovis or the Wacom Link Plus.

Otherwise, any of these HDMI to USB-C adapters will do.