I see some older threads surrounding this topic, but nothing recently. Is there any hope of Roku ever supporting image-based subtitles, like PGS and VOSUB? I have no issues with these subtitle formats on other players - just Roku. I love almost everything about my Roku devices except this one feature that I would have thought would be standard and supported in 2022.
My personal feeling is that Roku is only concerned with Internet streaming and has absolutely no interest in personal streaming, so the answer is most likely "No". I doubt that any of the big providers have a need for that feature.