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).
Ultimate Compatibility: USB C to HDMI Adapter for MacBook, iPad, Dell, Surface & More
12 Review
🔴 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
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
Portable battery with wireless charging support COMMO Magnetic Power Bank, 4 600 mAh, graphite
23 Review