I use this to run an instance of Hyperion on the tv to run leds on the back of it, that dynamically change color to match the show. Since it's native on the tv it works in jellyfin or my pc hdmi cable.
For me running jellyfin in the tv works so well, it's worth giving it network access.
If it's just a private instance, your storage needs will be way less. We use object storage, so it's actually pretty cheap (like $5-10 a month iirc). We're not storing that all on the server disk.
Yeah you would need to use a ; instead of &&