I saw that LG channels do that (That's why I think it's possible), my question is that if I could somehow add the iptv channels I want, with some app or something (without using external hardware if possible), to the list of live channels that the TV has (Where for example you can see the channels of tdt, satellite, etc.)
It's a proprietary IPTV app that has licensing agreements with other services like Pluto TV, same with the Samsung Live TV Plus, you can't just import channels. XUMO provides the channels to the LG app, it's hardcoded.
If it does in fact allow to import channels, then set up an xTeve server on a computer, feed it your m3u list, it will have an IP and XML address... Feed that to the TV.