Synchronizing Signal messenger chat history from iPad to Android

Some time ago I added Signal to my iPad and without ado it fetched the complete chat history from my Android phone. Now I had to reset my Android phone, and assuming the other way would work as well, I didn't create a backup. Turns out: the respective option is missing under Account. Similarly, on the iPad, there is no option to backup everything. Can this be done: synchronize the chat history of the Signal app on the iPad to a reinstalled Signal app on Android? This is not what works for me: https://cight.co/backup-signal-ios-jailbreak/ .