[Anamon]

I don't think it's quite as simple as that. The keys are stored in a storage area that Android locks off as WhatsApp's alone; no other app can get to those keys.

At the very least you'd need to root your device, but even that might not be quite enough going by my memory of trying to export my chats once. I remember the only documented working path included something like installing a shady, modified APK of a legacy WhatsApp version with an outdated encryption method to a second device and then somehow getting the new app to write a backup in the legacy format, to then restore to the fake second device and decrypt. I quit there because the risk of actually losing my entire backup seemed too high. And that was about five years ago, so I'd assume if anything, it's even more difficult today.