FFmpeg no set languages metadata on subtitles files

[naruh]

FFmpeg does not set the corresponding languages ​​within the subtitle metadata.

[MasterQuestionable]

͏    Factors to reproduce?
͏    ​https://i.ibb.co/K7hJRBH/image.png

[MasterQuestionable]

͏    I believe you may have to manually specify alike mostly.
͏    https://ffmpeg.org/ffmpeg.html#Main-options
͏    ("-metadata"?)

Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 4186 kb/s, 59.94 fps, 59.94 tbr, 60k tbn (default)
͏    Metadata:
͏    handler_name : ISO Media file produced by Google Inc.
͏    vendor_id : [0][0][0][0]
Stream #0:1(spa): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
͏    Metadata:
͏    encoder : Lavc61.31.101 aac
͏    vendor_id : [0][0][0][0]
͏    handler_name : ISO Media file produced by Google Inc.
Stream #0:2(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
͏    Metadata:
͏    encoder : Lavc61.31.101 aac
Stream #0:3(rus): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s
͏    Metadata:
͏    encoder : Lavc61.31.101 aac
Stream #0:4: Subtitle: mov_text (tx3g / 0x67337874) (default)
͏    Metadata:
͏    encoder : Lavc61.31.101 mov_text
Stream #0:5: Subtitle: mov_text (tx3g / 0x67337874)
͏    Metadata:
͏    encoder : Lavc61.31.101 mov_text
Stream #0:6: Subtitle: mov_text (tx3g / 0x67337874)
͏    Metadata:
͏    encoder : Lavc61.31.101 mov_text