I'm not a frequent web article reader, so I'm not a perfect user, but I can see how this can fill in for those moments where I do come across a dense text and think "goddamn I don't want to sit here and read all this right in the middle of my workday".
Have you considered a youtube audio extraction extension? I personally prefer videos over articles when it comes to learning about things, and most of the time I'll tuck my phone in my pocket and just listen to the audio. Seems kinda similar.
Either way, good luck, I see something like this working. Passive audio is just more convenient than dedicated article/video consumption time.