ACASIS USB C Splitter with 4K@60Hz Video Output, USB C Hub 10Gbps with 1xHDMI, 1xUSB C Video Output for Portable Monitor, 3xUSB C 10Gbps,100W PD, Multiport Adapter Splitter for Dell/HP/Mac Pro/Samsung

This should work for any HDMI device. Also let's you power a usb-c alt display device while using your glasses. I use it with a streaming stick and also my Steam Deck. https://www.amazon.com/dp/B0DF2MXV89 ETA- You should be fine running an HDMI cable from your 4090 straight into this hub, but don't forget to also run a power cable to the hub as well to power the glasses.

You can get a USB docking station. Make sure it supports HDMI input, USB-C display out, and power delivery. I got one for about $40 online. You can use any HDMI device with this. I use this with a streaming stick or sometimes with my Steam Deck because it allows me to charge the Deck while using it. https://www.amazon.com/dp/B0DF2MXV89