Download / Export all transcripts of a collection or my whole history

I like to download transcripts of all the conversation I’ve had with a person, or all the meetings I’ve done in the last few weeks (or ever!) and give it as a context to ChatGPT or other models. Example: I use the whole transcript of a few technical meetings and provide it as context to ChatGPT / codex to develop or debug a feature. Or I use all the meetings I’ve had with VCs as context for a negotiation, suggestions on next step, etc.

To do so, I currently download one by one each transcript. I’d like to be able to select multiple meetings or a whole folder or my whole history and download a large file with all the transcripts ready to go.