I'm going to attach a few documents that HLAA provides about telecoils, hearing loops, options on hearing aids, etc. Telecoils use induction technology to transmit directly from a source to hearing aids. It blocks the hearing aids microphone so all you hear is what is coming to you via an audio device. One document explains hearing loops. I mentioned a 'neckloop', which is a personal hearing loop you can wear around your neck that plugs into personal audio devices. I use it on my cell phone, laptop, and other small devices. Streaming is a more sophisticated technology that requires an intermediary device like a streamer. I know some Widex aids have this technology, but no all of them.

I've been using hearing aids for decades. The telecoil is the most valuable option I've ever had. Yet, the providers often don't promote it or even explain it. Ask your provider if you have them. If not, be sure to insist on them next time you buy hearing aids. Funniest thing....telecoils add less than $10 in cost to a hearing aid. BlueTooth adds at least $1000.Guess which they promote. Here's a link are to information from The Hearing Loss Assn. of America, Inc. I hope this is helpful.
https://www.hearingloss.org/news-media/brochure-downloads/
The HLAA website is: http://www.hearingloss.org

About Zoom's auto captioning. It has to be set up by the host of the meeting and can be set up permanently in the advanced settings. People who want to see the captions can click on the icon on the bottom right. Those who don't want them don't have to have them. It's good to know they can be dragged to the top or side of the screen if they cover information.