Given a hypothetical folder structure like this:

Star.Trek.Discovery.S04E06.German.DL.1080p.BluRay.x264-iNTENTiON/
├── star.trek.discovery.s04e06.german.dl.1080p.bluray.x264-intention.mkv
├── star.trek.discovery.s04e06.german.dl.1080p.bluray.x264-intention.nfo
└── Subs
    ├── star.trek.discovery.s04e06.german.dl.1080p.bluray.x264-intention-eng.idx
    ├── star.trek.discovery.s04e06.german.dl.1080p.bluray.x264-intention-eng.sub
    ├── star.trek.discovery.s04e06.german.dl.1080p.bluray.x264-intention.idx
    └── star.trek.discovery.s04e06.german.dl.1080p.bluray.x264-intention.sub
Star.Trek.Discovery.S04E07.German.DL.1080p.BluRay.x264-iNTENTiON/
├── star.trek.discovery.s04e07.german.dl.1080p.bluray.x264-intention.mkv
├── star.trek.discovery.s04e07.german.dl.1080p.bluray.x264-intention.nfo
└── Subs
    ├── star.trek.discovery.s04e07.german.dl.1080p.bluray.x264-intention-eng.idx
    ├── star.trek.discovery.s04e07.german.dl.1080p.bluray.x264-intention-eng.sub
    ├── star.trek.discovery.s04e07.german.dl.1080p.bluray.x264-intention.idx
    └── star.trek.discovery.s04e07.german.dl.1080p.bluray.x264-intention.sub

4 directories, 12 files

What’s the best way to integrate all the subtitles into the corresponding MKV file?