It's not really built for it. Looking at the code, it encrypts locations with a password that serves as an encryption key. This is fine if the underlying cryptography used is strong enough, especially if the location isn't a home address for example (because if it's just a random place you happen to be, odds of a good pass getting cracked are slim to none) but for end-to-end encrypted messaging much more complex mechanisms are used - check out the documentation for the Signal Protocol for an idea, most encrypted messengers use the Signal Protocol or something very very similar, that's the industry standard now.