If you run strings on one of these heap dump files, thousands of lines will scroll by, and some of them will be juicy-looking JSON objects containing plaintext chat messages, along with other interesting data. For example, I might find an interesting-looking message that's part of a group chat, but without any other messages from the same group. Sometimes the same message is repeated multiple times, but the JSON objects are slightly different, like because two different people in the same group archived the same message.