I used two of these to distribute power from my TV's USB port to three devices. Now my ChromeCast, the TV LED and the active antennas use my TV's USB power supply (and turn the TV on/off).
USB to USB Type-C adapter
18 Review
4K / 30Hz USB-C to HDMI Adapter - 3-in-1 Type-C Converter Cable for MacBook Pro, MacBook, Mac Pro, iMac, Chromebook, and USB 3.0 Type-C Devices (2017/2018)
13 Review
Tobenone USB C to USB Adapter with π» 2 Ports for MacBook, Dell XPS & More Type-C Devices
13 Review
π΄ 2 Pack JSAUX HDMI Coupler Female to Female for 4K HDR Extension - Aluminum Alloy Adapter for HDTV, Roku Stick, Computer, Monitor, Laptop, Projector, DVD Player, PS 4/3 (Red)
12 Review