just get yourself a $40 4k fire stick, sideload the app and be done with it. Console is overkill to watch iptv, save the life of your expensive console.

But yes, Plex would the way to go IF YOU HAVE TO.... not recommended

I think using Plex is the only way.

You can use Jellyfin and add IPTV to that as a tuner, then use the PS4 browser to open up. That works and I've done it.

There is no browser on the PS5 but some people say that you can send a message with a web link and open it and that works. I have not tried this however so can't say for sure.