Ytdl-sub is what you want. Does allmost all of that. Has sets up nfo and plex. Really great app. Takes a bit to config but the dev is ver responsive and is on discord all the time.
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https://github.com/Tzahi12345/YoutubeDL-Material
It does support sponsorblock. You need to add a tag within the command and it’ll apply it to all new videos.
Also, if you use docker, I can help you with the installation.
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Download this file: https://github.com/Tzahi12345/YoutubeDL-Material/blob/master/docker-compose.yml
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Go to terminal and navigate to the folder where you downloaded the file.
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Copy this code and hit enter: docker-compose pull
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Copy this code and hit enter: docker-compose up
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Wait for 15 minutes and in the container log
 
If successful, it should say "HTTP(S): Started on port 17443" or something similar. This tells you the container-internal port of the application.
Try both ports and see if it works 8998, 17442
2nd'ing. I tried TubeArchivist too and preferred this