Short answer no.
Plex works by having a centralised server run by Plex themselves, that facilitates your client connecting to your server.

The external facing part of Jellyfin server is basically a web server, and it's a bad idea to expose that to the internet without putting a reverse proxy in front of it (hence the mention of NGINX above).
Another option is to have a VPN connection to where you are running Jellyfin and then only access Jellyfin pseudo locally (so potential security problems aren't a big concern). This introduces other complications if you want to access it remotely via things like Roku or Chromecast, especially if you have multiple external (and probably not tech savvy) users.

I want to stress that none of this is prohibitively expensive or hard, but doing it involves learning and effort.
All the information and programs you need are available online for free.

If you only wanted to use Jellyfin at home (server in the cupboard, client on the tv), none of this other stuff matters. If you want to access Jellyfin remotely, and the idea of running a reverse proxy or a vpn server with the corresponding exposed ports and domain configuration sounds scary, Jellyfin is probably not for you.