JSAUX 4-in-1 USB C Dock for Handheld Gaming, HDMI 2.0 4K@60Hz Output, 100W Power Delivery, 2 USB 2.0, Compatible with ROG Xbox Ally/Xbox Ally X/Steam Deck LCD & OLED/ROG Ally X/Legion Go 2/S-HB0503

https://a.co/d/0hxYTa9f Just use this and any hdmi cable Plug your charger into usb-c on dock, plug built in cable into your ally charger port. Plug hdmi into hdmi port and the other end in your tv. the usb A ports will function as USB ports on the ally. $20 plus any hdmi cable you have lying around the house. There are some with more features but it doesn’t seem like you want to invest in your handheld. This might be the cheapest dock