tipofthehat
I really think support for native content is the ideal way to learn for someone like me, especially with listening.
Thanks for posting and good luck.
I'm a non-techy person learning from scratch so it's slow going but as a language learner who selfishly wants more tools to support immersion learning if you want to support audio I think something podcast based would be super interesting.
The idea is to give me vocab, phrases and idioms with timed with a transcript to appear just before the audio, with some feedback on understanding and a simple learning model of users level, vocabulary, strengths and weaknesses etc
I've made a start using whisper and some simple Bayesian modelling but if anyone more technically gifted wants to steal my idea they're more than welcome... As it's going to take a while for little old me.