Exporting or downloading content from channels and chats (instant messages/out of meeting)

We have been utilizing several different platforms for instant messaging/chat outside of meetings including Zoom.

We're now moving to standardize on a single platform (not Zoom) and we have users asking if there is a way that they can export or download their conversation history with colleagues and save it locally on their machine.

The copy/paste into a Google/Word doc is a cumbersome and time-consuming option and we're hoping there is a better path that someone has found. Ideally this would be something each end-user could do as some channel/chats are not important to export/save. Suggestions?

Thanks in advance for any guidance.