Encrypting Ext4 Partitions Without Re-formatting It. How ?

After Google pushed <a href="https://lwn.net/Articles/639262/" target="_blank" rel="nofollow noopener noreferrer">ext4 encryption patches [LWN.net]</a>, I was kinda excited to implement it on my system. Anyone out here have knowledge to encrypt Ext4 FS without losing my data/ without reformatting my drives ?

Any small help or even showing me right direction would be very much grateful. I can't think of going back to BtrFs.