Can I merge 2 subtitles and burn to mp4?

[bk111]

youtube-dl -ci -f "bestvideo[ext=mp4]"+"bestaudio[ext=m4a]" --restrict-filenames --write-auto-sub --sub-lang zh-Hans,en --embed-subs --convert-subtitles srt  --merge-output-format mp4 --exec "ffmpeg -i {} -vf subtitles={}:force_style='FontName=Arial' -acodec copy temp/{} "  url    
 I use above command to burn 1 subtitle into mp4, 

Can I burn 2 subtitles in a time?