Simultaneous horizontal and vertical subtitles Japanese asynchronous subtitles
To display horizontal and vertical text simultaneously on the screen, you should use multiple tracks. You can have the horizontal text on your primary track, and the vertical text in a separate subtitle on the other track.
If the subtitles are on different tracks, they can overlap on the timeline.
Keep in mind that not all formats support vertical orientation and overlapping subtitles. Currently, it's supported in IMSC1.1, ITT and Videotron Lambda CAP exports
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