Use the computer next to your TV as a media player, controlled from your phone.
TinyPlay for macOS and Windows is free and open source. Control it from any phone browser — no app needed. Browse Jellyfin, Emby, Plex, local folders, network shares, IPTV, DLNA, or simply open any website like YouTube and Netflix. Seek, switch audio/subtitles, and change speed without a keyboard or mouse.
A separate Apple TV app is also available (core free, one-time Pro unlock).