Is it possible to use Retained Strings?

Jusa quick question:
Is it possible to use “retained Strings”? Somehow I thought to have read somewhere that this was not possible, but I cannot find that part in the Reference Docs anymore

While you are unable to use retained String objects you can use char arrays and statically allocated data structures. In most places in the API you can use char arrays instead of strings.

Also, on Gen 3 devices you can use the File System library for storing persistent data.