Thank you, fokrones!! Finally someone with a more or less actionable solution. I can confirm the subtitles functionality working across all devices (incl. LG OLED). MaxPlayer is not free though (€1,50 per month for 5 devices), which I am happy to pay.
Thanks again!
UPDATE: after 2 months of use I can report the following about maxplayer.tv:
1) the display of subtitles sometimes differs depending on the device. One example: on LG TV only English whereas Multi Sub on iPad.
2) there are some bugs: for some episodes of GoT there were no English subs to choose from on LG TV. On iPad no problem.
3) the quality of the picture seems to be better on maxplayer.tv compared to Smarters iPTV but maxplayer.tv had more buffering issues than Smarters.
To sum up, not very happy at the moment. Hoping to find better alternatives with working subtitles across ALL devices and no buffering issues. Any suggestions??
