I've had a basic DLNA server running for over 5 years and just set up jellyfin about a month ago and it's an absolute game changer. It has the functionality of a good streaming service except using your own media. It searches databases and matches it to your files so you get some really good images with the interface and information about the media. Plus it remembers what you've watched and how far you are into episodes and movies. Which is perfect if you have two or more TVs or devices you watch on.
It's changed my partners preferences on how they watch shows. They hated watching anything on my server because they have ADHD and it's impossible for them to figure out what they were watching and where they were in it, not to mention trying to navigate my lack of organizing anything. Jellyfin fixes that. Now I just plop a show into the shows folder, or a movie in the movie folder and it's dealt with.
In my experience the jellyfin app on my LG TV works phenomenally. The media app is absolutely horrendous, it takes several minutes to list media files every time a new folder is opened.
Jellyfin has been a game changer specifically in keeping track of what I've watched and how far into an episode or movie I am. Everything else is a bonus.
I have an lg TV, and have plugged in a Chromecast and a Fire stick. Jellyfin can stream to Chromecast and the app is available on fire TV to connect to your server. I'm switching to a linux based living room PC at the moment for more privacy. I've also tinkered with raspberry Pi in the past and it works well with Jellyfin.
There are so many options, you honestly don't have to be held back by LG.
There's a Jellyfin app for webos, but the garbage store does not really let them to publish/update it. You can get an up to date version from the store app called Homebrew Channel.
This store app can also handle rooting related things, but that's not needed for Jellyfin, and both can be installed on a nonrooted TV.
That's an other question that the TV will regularly delete these apps until you root it.. but take it as an "evaluation period" haha, if you like the app there are a few ways to make the app persistent.
You can install the jellyfin app for older versions of LG WebOS, but you have to build and install it from a computer. Aside from that minor inconvenience, the app is pretty great.
Do you know if the same is true for Samsung Tizen? I tried to install latest but it failed - was already planning on picking up a Fire stick to run it.