I hosted my jellyfin in Synology DS224+, but I need to upgrade the RAM first, 2GB is not enough for jellyfin, I added 16GB so it has 18GB total now

I think Jellyfin already released to Tizen OS, although not all model supports it https://github.com/jellyfin/jellyfin-tizen/issues/222#issuecomment-3831638580

If you want to try, it should be possible to install it yourself instead of waiting it to be available in Tizen app store