OTT and IPTV Middleware and App Solutions for major platforms
ottrun.com
However, smart tv's having limited cache/memory and possibilities of apps. better try IPTV SMARTERS or SMART ONE iptv app. but you would need to reduce bouquet list in order to reduce m3u file size (because of limited tv cache/memory).
Best would be to use an android box, e.g. amazon fire tv stick.
Yes, smart tvs have very limited capability. I've had many customers ask me why they have issues with thier streaming services and when I ask them what they are using to stream they say thier tv. I always tell them to go with android streaming devices. 4k firestick is a good start, a MI box s is a set up and both are very reasonable price wise. I personally use Nvidia shield.