Subtitle position based on aspect ratio?

Is it possible to set the subtitle position according to the video that is playing? For example, when I play a 2015 movie with black bars, I would like to have the subtitles on the bottom of the video, but if I play a 4:3 old series, the bottom of the video is at the bottom of my screen (because my TV stretches and zooms it - Sony Bravia KDL-47W805). This is causing the subtitles to appear too low to comfortably read. I have to change it to fixed, so it sits higher) and start the movie/episode again. I bet it’s not possible yet cause I looked everywhere, but maybe a cool idea to define two subtitle positions and have OSMC/Kodi decide what the position should be?