jm æû_%¶æÅê¨÷$`¨æ ¶gïåæPÂHª2cªDTLThere might be a way of storing it on chain by encrypting it first with your public key. This way it would work in every client you used.
https://whatsonchain.com/tx/3ce2bca242dcdf2500cf6f72fac1a6b7a884a424d7ce0bf71298ba6af39f19ae