Couldn't you just use a file with (normally) encrypted keys and values? I'm probably slightly misunderstanding the premise of this project.
I'm sure someone will correct me soon :)
Ciphertext can be used for keys or values in a normal key-value store...
The premise of HE is really cool. I think it's just early days yet.
[0] https://github.com/homenc/HElib/blob/master/CKKS-security.md