Maybe look into getting a GL.inet travel router with WiFi and a Chromecast/Android stick. I use that when I travel. Setup a WiFi network on the travel router and setup the Chromecast on it for when you're at the hotel.

At the hotel, either jack the travel router into a network port then use your phone to sign in to the hotel's network, or configure Repeater/WISP to get the travel router to connect to and re-broadcast the hotel WiFi (again using your phone or PC to sign in). Going Repeater/WISP brings a sizeable performance hit due to the lack of radios but it's definitely do-able.

If you're hosting Jellyfin externally, job done. If not, you can configure OpenVPN/Wireguard on the travel router and your home router and connect privately that way.

Source: Tech worker who had a requirement to be overseas 80% of the year in different hotels :)

https://www.gl-inet.com/collections/travel-routers

https://wifirepeater.org/openwrt-wisp-repeater-mode-configuration/