Dan Burton has a utility for bulk import. I need to look into it, and you may want to as well. Details are here: https://forum.lingq.com/t/extension-rooster-playlist-import-for-lingq-youtubespotifylistennotesapple-podcastsmoviestv-showsbooks/588128/18
Now to answer your comment …
I virtually always transcribe to the language of the video (my target language). Occasionally I will choose another language, import the text, and finally let Lingq generate the speech. It’s important to realize that Turboscribe relies on you telling it the target language. It won’t automatically decide what language it’s hearing.
Using Turboscribe allows me to import as much audio as I want into Lingq. I create a lot of lessons based on personal interests. It’s handy also that Turboscribe extracts the audio from Youtube for me.
Besides that, I can extract my choice of transcribed text: srt, text, etc or all of them. thanks to Turboscribe.