'Is it possible to increase horizontal and vertical padding on ffmpeg burned subtitles - using .srt format?

Using command :

ffmpeg -i source_video_path.mp4 -vf "subtitles=srt_source.srt:force_style='OutlineColour=&H80000000,BorderStyle=4,BackColour=&H80000000,Outline=0,Shadow=0,MarginV=25,Fontname=Arial,Fontsize=10,Alignment=2'" video_destination.mp4

I get

enter image description here

Ideally I would like to increase the subtitles background padding - especially horizontally.



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