Hello again @Scheulioppie72,
With the intervention of @Doremi, I took care to contact our experts so that they could analyze your request.
On some channels, subtitles are supported via Apple 4K, however, there are not many of them.
The information I provided is no longer correct, which was previously the case.
Please forgive me for this false news.
I am waiting for feedback from the specialists regarding your situation and I will come back to you as soon as I have news.
Have a good rest of the day